Get a tall deck 351w if you can 1971-73. Move the wrist pin as far up on the piston as you can without getting into the
oil rings. so you can get the longest con rod you possible. I like edelbrock rpm heads ported better than victor jr. heads; TFS heads are nice too. Victor jr. intake, aluminum flywheel. Depending on how much money ypu have to throw at it: Roller cam, steel roller rockers, stud girdles, ARP main and head studs, aftermarket steel crank, H-beam rods. Cam selection depends mostly on how high you can take the short block. A short block / valvetrain that's good for 8000 rpm can use a whole lot more duration than a crank / rod combo that needs to be shifted by 6200.The 6200 rpm motor likes a cam with 220-240 degrees on the intake at .050" lift, depending on compression,gearing weight, and everything else. A too small cam is much better than a too big cam. It won't sound as nasty, but will be faster and more fun.