Heres my 2 cents, find a 455 run the 6x get a good valve job! Port match a Torker intake not a Torker II run an 800 Quadrajet that has been built by someone who stakes there rep on them. run a good solid (roller if the $$ are there) 520-550 lift range, H-beam rods (they are around $300.00 a set) forged flat tops, make sure your crank is true, block squared etc. You should be around the 8:5 comp. range , pump gas. This combo will last and have gobs of torque, good luck getting it too hook up!!!!