I am a chevy guy but since this is his FORD I did not even mention it. I mean a pre 70's car like the cougar needs a ford engine, I do believe in keeping a car all one make, Unless its a drag car(then I would recomend the Chevy Big Block)LOL.
But seriously he has already got new motor mounts and headers and starter and alteranator and all that good stuff so we will go with the 351W. Even though I don't know much about a fords. What will the 2 bolt block handle? Or do they even make a factory 4 bolt? The only thing from the engine we would use would be the Block, the rest will be trashed and replaced.