Smallblock efficiency or How to have your cake and eat it too

mgoblue9798 said
I'd like to pick the collective brain about my build. Building a stock stroke 340 forged arias pistons zero decked, stock 340 rods, magnum style heads, probably RHS X, but have EQ's and and Eddies already as well. So 10.5 to one with iron or 11.0 or so with Eddies. Magnum style air gap, thermoquad w/ adapter, and magnum accessories inc serpentine. I have a set of Doug's already. Maybe 3.91 gear or 4.10 8 3/4 have not decided yet. Using a A500. Yes, I am married to an automatic with my bad back and knees. This is going in my 3700lb Challenger. I was thinking of running a fast ramp cam in the .230 @50 range, and maybe a 2400-2600 lock up converter. This will be a street car. Priorities in descending order are
1. 100k plus reliability
2. Efficiency - 20mpg hwy
3. Ease of maintenance (again with the bad back)
4. Idles well enough to run A/C and enough vacuum for power brakes.
5. Fun and quick as hell light to light on the street.
Loose goals of 425hp and 425 torque with a nice flat torque curve, and 12.5 or so 1/4.

Questions:
1. EQ's and RHS heads now have 1.92 valves. Will clean up ports to flow 250-260 or so. 1.92 ok or upgrade to 2.02?
2. What specific cam choice(s) would you recommend?
3. Converter stall?

Any and all advice is appreciated. Thanks ahead guys.

If you are married to the TQ I’d find a different intake manifold. Running an adapter is a guaranteed power killer and distribution nightmare.

If you want a good selection of .904 lobes, Howard’s has the most I’ve found. Like a couple of other cam grinders, getting them to use them is near impossible, especially if you tell them it’s a “street” car.

I think 3000 is the lowest stall you should use.

Select your gears and figure out what you CRUISE RPM will be and pick your cam based on that. 3.91’s and an OD still might not get you 20 MPG. If you are married to that number you need to rethink your gearing and cam timing.