318 with 360 heads and compcam build help

Since you've got a '67 318, get it sonic checked. If it will hold a four inch bore, here you go.

https://www.jepistons.com/product/s...EVUEye9YLQFLPGe_XlGZyARrH0eymAJtXfrw5ybT9Ky--

JE Pistons 345794

That would allow to use your 235/249 cam if... you have the block decked for minimum of .045 quench for your 360 heads with a Felpro 1008 head gasket (Fel-Pro 1008 Fel-Pro Performance Head Gaskets | Summit Racing) and just get the heads surfaced enough to clean them up. Have the chambers polished and learn to tune.