There are a few things I would question..
1) Is the distributor in the right place ( not 1 or more teeth off)?

2) What are the chaces you have a vacume leak in the intake or under the
carb?

3) All of the above?

4) How many miles on engine may be timing chain??


OH I didn't notice till I posted Welcome to CHR If it can be fixed there are people here that can tell you how.