Need help NON mopar 1967 Pontiac Lemans 326

Well, IMO, it's very obviously a timing problem. So, also IMO, you should get the timing DEAD RIGHT according to the service manual, then, if you still have issues proceed. I have seen this before where someone had the distributor in in a similar fashion and when we put it in correctly, the engine ran right.

Lastly, and also my opinion, unless a distributor is not installed correctly as per the FSM, it isn't right. I have had Mopars that would not run right without the distributor indexed correctly.

Yes, they "should" run the same no matter where the vacuum can is, or no matter where number one is, but from my experience, that is by far not always the case.

As short a time as it would take to correct, I would have that distributor in right.