318 build

You really need to know what you have. J heads are great with the right combination on a 318. If they have not been milled before, you can have them milled .040 and .038 on the intake side. That should get you down to 65cc per chamber. Do yourself a favor and call Jim at Racer Brown and get a custom cam for your combo. You will need to know a lot about your car for him to know what will work best, gear ratio, tire size, compression. You also need to be honest with yourself about what you want.