318 tuning help please. multiple issues..

crackedback said
Plug installed in the rear of carb?

Sounds like a huge vacuum leak.

Or a valve problem or 2 and a high idle to make up for it. (Vac jumps around a little)
But that could also be caused by cam overlap.

What would be really nice is to see a couple of plugs (a couple if they all look the same that is)

Rob I know you know this, I was trying to add some next things to look at for the OP.