Thanks for the link vdriver.

I'll double check the intake , but it is stock 71 340 manifold .
Went back and found model number on back DS tab, looks like model # is 4973S

Chris, I popped the cap right after it wouldn't start hot, for any pressure, and there didn't seem to be any.
adding vent lines seems like a lot of work than I want to tackle right now on the car.
I am going to start with a phenolic spacer once I figure out which carb/ intake set up I have at what spacer I need.