I just saw your post, don't have the answer but my son also has a '76 but 4 door version with inline 6. Loves the car like it was some cadillac. Me not really but it had under 60k miles and in great shape til he got it and let a shop tell him all that was wrong with it. errrr It's been sitting over a year and we need to get it started. The shop put a chevy firing order on it and i'm sure screwed up the timing and probably hoping he would bring back for repairs.

It always had a small issue but although I told him never trust a repair shop or oil change place he did. Poor ol car. Hopefully when things cool down and car show season is over we can start with top dead center and get it going again.
Good luck with yours!!