Thanks Firebob!!
so basically a 350HP 400 of first gen Era with a 4 speed being conservative at going plus 15% would be a 400 HP motor of todays rating.

Funny in talking to most of the rebuilders if I say I want a 350 to 400HP motor, all but one have told me to the flywheel when I tell them rear wheel HP the number jumps significantly.

Other than the fact that the 400 engine had high compression which sucks for todays gasoline an almost stock rebuild using a Pontiac cam spec would easily give me 400HP by todays standard I would think