Slant 6, 318 or 360?

I'm not sure, because it's not dynoed, but I'm expecting maybe about 350hp and around 400ftlb of torque. I have a 77 block bored .30 over, stock rods and crank. 9.0-1 comp., J heads with 2.02 valves, stock 4bl intake, 670cfm Holley carb, block was decked and the whole thing balanced, Comp cams extreme grind .462 lift cam, headers, etc.