just some food for thought:
unless the main major goal for the build is to hit a specific strip et and mph you can honestly ignore the HP number....
(the HP number is basically applied TQ measured over distance and time)
what makes a really fun to drive street car is all about max TQ possible available over the WHOLE rpm range....
it's the TQ rotational acceleration force that pushes you back in the seat and gives "instant" gas pedal response and wicked quick mph and rpm's increase passing somebody .....
when you build up the HP to 1HP per cube, you don't gain much more TQ (if any) and usually have alot less at street rpms due to the cam (that's why a big HP cam needs very low gears and a convertor swap, no low rpms acceleration force TQ available to move the car weight)
(very very roughly motor cubes=max TQ ft/lbs....)
with just a stock 87 octane 451cu/in motor your 450ft/lbs x 3.55 gears in high gear (1:1) = 1597ft/lbs of force available twisting the hides at roughly just 3400rpms!!!!
due to poor weight distribution in a PU it's gona be a challenge to get the tires to hook up at all in first gear (and not break lose on a wet road) with that much flywheel TQ!!!
a favorite Max Keith (a member) saying that's so true so often: "ALOT more gooder isn't necessarily more good"