Schubeck roller lifters, stroker HP estimate

There's really only a couple of things I can see. First, head choice..I'd look to either MP big port Commandos, or the Edelbrock RPM Magnum heads. Factory Magnum heads even with decent porting IMO just cant move the air well enough to do any more than 475hp in most cases. They flow very well for street type engines, but with NOS and a solid roller, I dont think they will be the best fit for this build. I would also run a single plane if you plan the NOS use. It will be easier to tune with a single plane (better distribution for every hole and larger plenum to help bend/turn the air). An M1 would be a nice medium sized piece. The carb needs to be at least 800cfm, and a DP version. The studs in the Magnum heads should be fine. They arent my best subject, but I believe they all use screw in studs, and they will hold those specs easy. Also, you can use Chevy rockers for less $$, and get a variety of ratios. BTW, Magnums use 1.6 rockers, so the cam will be bigger feeling if it was spec'd for LA engines. That is a small roller, if you are concerned with flat tappet loss, you may want to consider using a Magnum block to start with, so you can just use the hyd roller setup the factory does...It's four figures cheaper than the path you're looking at, but will make slightly less power (that's what the NOS is for, right?lol). In terms of solid rollers, Schubecks have no failures I know of, but I havent ever used them, and the guys that I know did (only a couple really), dont use thier cars on the street. Comp has that new Endurex solid roller, that has an EDM oiling hole in them to help keep those stupid needles in place..And the light profile and spring pressures (for a roller) should mean even the std solid rollers should live for a while. The ones that come apart usually are running a lot more pressure, and are not street profiles. Also, in terms of saftey while running the solid rollers..You may want to bush the lifter bores. I wont run any roller besides factory without bushing them. That eliminates any side-effect lower end damage should a lifter/pushrod/rocker/spring fail. It also stabilizes oil pressure bleeding out past worn or O/S liffter bores. Also, you'll want to make sure the Schubecks you go with allow pushrod oiling..The Magnums use that too. On the Jesel, that looks cool, and makes cam timing cahnges easy, but you sure you want that? A decent roller chain and tensioner can get very similar performance results for much less. But it doesnt dampen harmonics or let you switch cam phase without pulling the timing cover. In terms of HP, a recent dyno session (not tuning, just stuck the car on the rollers):

418 (340 + .040 and 4" MP crank) running a .520 lift 220 @ .050 solid flat tappet cam, 1.5 Cranes, Edelbrock LA heads (mild port cleanup), 10.8:1 quench dished Ross pistons, Edelbrock Performer RPM (not air gap), a 3310 730 carb, and 1 5/8 headers with flowmasters, 727A, 8 3/4.

It makes 450HP at 5300, 510TQ at 3400. Pump gas, idles at 16" vaccum. With a larger cam, larger intake and carb, and better headers, it would very easilly clear 500hp, and move the torque peak up 1K rpm. It's actually hard to drive, because the torque curve is so flat, it will tear up the Hoosier QT Pros at any speed under 50mph, in any gear. He is now re-stalling (lowering)the convertor, and raising the gear ratio to make it more drivable.

In your case, with good machining, and good heads, it should be well over the 450 mark. Closer to 525 depending on the heads used, and with the NOS, you are seriously stressing the factory block. (I use 600 hp as the limit for factory small block builds) If you can afford the parts to run that power level, you can afford the $2200 new block. Really, the girdle, the caps, the studs, the bushing of the lifters, and the rest of the quality machining will run more than $2500 anyway, and it's still thin cylinder walls and 2 bolt mains. Also, with the factory block, and NOS use, I'd rethink the Eagle forged crank deal...A Callies is a beter part, that wont flex and stress the mains as much. You can spend now, or spend later. My $.02 anyway...Definately sounds fun in any case...lol.