505 rb build advice needed for 39 dodge

I don 't normally get this way, but WAY COOOL ******* TRUCK.... way cool...

On the engine... As IQ says, without porting most heads are close. For what you're doing, I'd run cleaned up RPMs. The can make close to 600hp and 600tq with enough cam. I'd use a solid flat tappet. It will give that cool idle sound and make the numbers. The 4.25 stroke/7.1 rod is a torque monster. The last one I did in a 4100lbs E body convertible has rendered 1st and 2nd utterly useless with any throttle, and part of 3rd the same way at full throttle. They are beasts. But that truck looks the part.