Like I posted earlier, any 70's 440 (truck,car,motorhome or otherwise) will be fine. With a cam intake and headers 350 hp is easy and it'll still be driveable, don't get hung up on the "high compression" late 60's/early 70's 440's. Did they have better compression? For sure but it was no where near advertised (except 440 6packs, they had a better piston). Any 70's 440 is essentially the same. Were there differences, sure, but it's mostly in things you'd change anyway (cam/valve springs). They all used the same heads, same intakes and the same blocks/Pistons. Plenty of guys on here have used low compression 440's pulled out of New Yorkers, trucks, motor homes etc and made decent performers out of them