I have a gauge that tests both vacuum and fuel pressure (Sears), but it's probably at least 55 years old (got it when I was 15 for working on my '57...
a intake leak is ez to find with a can of starting fluid ............... i'm still suspecting some part in the carb but a timing advance plate moving...
The fact operating the choke sometimes helps could point to fuelling. I had an early One Ten , about 1983, and the carburation was an issue from new...
