Good cam size for stock 318 bottom on boost

It's a 67 valiant signt. Four door. Weights 3160 with me. 8.25 rear with 4.10 gears. Tire setup don't have yet so guys give me your input on tire and wheels. I have a 325.50.15 BFG drag radial on the rear. Stall I don't have either yet. Was looking at a 4000 stall? To big going to be running a 727 3 speed auto with a manual valve body.