looking for cam advice for a 73 318

A mild port, 1 5/8" headers, 600 cfm performer or Thermoquad and 340 cam PN 2899206 or Comp cams equivalent, they even have a free software to help you "design" your engine. Just to get an idea of performance gain. I got two secons off stock 1/4 mile time (stock 318 was slooowwwww). Idle is good as well as gas consumption. Good luck.