I've seen A LOT of posts about making HP with a 318-So why is it so ???

rusty
how bout a late hemi in that 64 valiant
I put an 'Elephant in on and that's a LOT of work
wedge might be slightly easier but whole front suspension has to be wider and heavier duty
I'd guess B might be easier than RB but getting exhaust out would still be a *****
and the weight would negate any handeling