Sounds like a cool ride!
Unfortunately e ethanol gas we all get varnsihes very quickly. What does it have twin webers? Pilot jet idle circuit jet and transition port are usually the first to clog since theyre so tiny. Did you happen to check the timing?
It's a neat little car. My wife has wanted one for a while, and I'm into british engineering(if it's fair to call what they do that) and small cars, so it was a perfect fit. I was looking for a project and found this before I could find the 67' Royal Enfield Interceptor 750 I've been drooling over for 10 years, lol.
It is twin carbs, but not webers. It has twin SU HS4's. If you know anything about those you know carbs don't get much simpler. I'm pretty confident it is a stuck needle, but will probably do a full rebuild. That is just the way I am. The guy I bought it from claimed to have rebuilt them, but they sure don't look it.
Thanks for the compliments on the pie. It may be the last for a while again, I'm FINALLY gonna start to tile it soon, but have a small issue I have to address first...more on that later.