critique this Magnum hop up, swap.

gregsdart said
I have a plan for putting a 5.9 Magnum motor in my 65 Dart behind a 904 and 3.55 geared rear end. I am looking for any suggestions for making cheap power beyond what I have already planned for. Here is the plan.
I have a used Comp hydraulic roller cam with .480 lift, and 279 duration on both intake and exhaust, with 224 degrees duration @.050 on a 106 Lobe separation. If it will clear, I want to advance it as far as 102 to help it work with the stock 318 converter. It will have long tube headers, 1 5/8 tubes with three inch collectors going into 2 1/2 inch pipes and super turbo mufflers under the trunk area. (The spare tire well has been replaced with a flat sheet of steel.) Induction will be a dual plane air gap intake and 3310 Holley 750. Since I have to change out the valve springs, and want to look inside the motor a bit, a little back yard bowl porting is an option, along with a thinner head gasket if the motor will tolerate the extra compression? I could also back cut the valves if it is worth doing. Any other tricks or tips welcome.

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Kinda like I have!...390 hp. Magnum Crate engine. Thermo-block is bored .020 over. Magnum R/T Big Valve cylinder heads. Mopar cast Al. valve covers. High strength SS Valves, 2.02" Int., 1.62" Ex. Heavy duty valve springs. Hydraulic Roller Camshaft- 230'/234' Duration @ .050"/0.513" lift. pistons 9:1 C.R. Double Roller timing chain and sprockets. Single plane manifold w/650 Double pumper. 150 hp. shot of NOS. Line lock. 3000 rpm stall. Hughes racing transmission w/B-M floor shift. All MSD ignition. MSD 6AL Control box w/MSD pro-billet distributor. Blaster 2 coil. 8 3/4" rear with 2.73 gears. (had 4.11 but changed them for better cruising). Dyno: 439.5 ft-lbs at 4100 rpm. 409 hp at 5400 rpm. Fun to drive. Makes me Carb 011.JPG