Thanks everyone for the great comments and also for the information. I will start looking around for the 6 engine and see what I can get. I may go with the resin engine, or buy the kits mentioned to get the 6 engine.
Again, thank you all!!!
By the way, I'm planning to built the COPO Camaro... what color you think would look nice? I have already used the Hugger Orange on the SS DX-1, I was thinking maybe Fathom Green?? Was the COPO available in that color?? Not sure yet.