If you want to do the big W hurm's right. You're gonna need a hammer a welder and a cut off wheel, the 302 is a big squeeze (hood headers etc) now add another inch. Plus an extra large shoehorn from the special tools isle. trans tunnel issues aside Having done the 408 thing in a stepside f150 I would say proceed with caution. The slightly smaller 392 and the 5 litre variant 331 vs the 347 are often better budget / daily driven engines. most big cube pistons cheat and have the oil control ring intersect the wrist pin hole which will scrub out the rings in 10 or 15k hone it and ring it and away you go but still. Or make sure the pistons don't have this "feature" What heads are you gonna do? it takes at least afr 205's to really do it justice I think. what are your plans for the back half of the car? cage, tubs ,slicks, ladders, irs? That is a lot of low rpm torque to hook up on 94 inches of wheelbase. I don't recall if you have mentioned the above before.
OhSix'