I like the "151" Chev cam in a 283. Juice lifters, good power, nice lope at idle, and lots of RPM. Same cam in a 350 works good, too, but the cubes "tame" the idle a lot. My 283 had early '60's Power Pack heads and new springs that were supposedly the heaviest stock springs then available. I shifted it at 7000 RPM with 4.11 gears, blew the doors off many cars with 100 more cubes.