Welcome to the Club !!
The h/b changed in '70 in relation to timing marks. Those with timing mark at 12:00, are for the long water pump starting with '70. However, there were some h/b in earlier years shown 10* off using the same pointer. I've been down that road personally myself.
The best you can do to aid in timing is to remove #1 plug, find TDC, and mark the h/b to the pointer. Make a circumference measurement, divide by 180, and mark every two degrees. I'm sure this will cure alot of your problems.
Others here have more knowledge of what part numbers go with what h/b to pointers. In fact, I have GMPP catalog and its listing of h/b. I fell asleep reading.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.