Where is my money best spent? In the heads or in the cam during my motor build I'm looking at the 3388 from socal in the alternate firing. My heads have about 160k miles on them. I think I should at least have them checked but was looking at the socal service or the exchage upgrade. I'll be running a Gt-3794 stgII from danville 80% injectors dual fuelers and will twin it later. I just want to make solid power and be reliable as a daily driver.