If those are older "X" or "J" heads, they have a CC of 68-70. If they are off a 72 charger, then they have a cc of 73. I wouldn't waste my money on those or the intake. You have to figure out what block you are going to use then go from there. Like I said, if you are going to use your 318, the pistons HAVE to be changed or use the 302 heads. It is cheaper in the long run not to use the 318. Modern hemi, 340 or a 360 would be your choices. As for the intake, an aftermarket intake is the way to go.. aluminum and better flow. Speedmaster also has those on sale for Black Friday, if you can wait that long.
