"There are two timing tab/harmonic balancer relationships, one with TDC at about 12:00 and another with TDC at about the 2:00 position."
Regarding this: this 327 has the tab mounted at the 2:00 position. Also, this engine in this truck was running okay before the distributor went out. But, it was always a bit hard to start. I always felt it was a cold start/fuel/carb issue, but all this recent trouble has me questioning everything.
