I just started for the first time a new build 350 SBC. Cam is roller with 280 duration, 1.5 rockers, MSD distributer, Blaster 2 coil, Edelbrock carb. The engine starts and runs with no pops or backfires and is very throttle responsive. I initially set the timing for best idle with no timing light. Later when I hooked up the timing light the timing was very high, at least 25 degrees initial with vacuum blocked. Engine will die when I back it off to 12 degrees. My question for you guys is it possible the cam gear is off one tooth to cause this problem? Will the engine even run if it's one tooth off at the cam? I can't drive it yet because the body is off the frame, just engine/tranny, frame & wheels at this point. Thanks for any help you can offer.