Since I got it running that last time I've had no problems with the carb. Still don't know exactly what was happening to this day. Either some sort of spec of dirt that eventually found it's way out or the carb base leaking. I think in the end I put a bead of Hylomar on every surface apart from where the carb joins the adaptor plate.
The only issue I have ever had is having to pump the accelerator a number of times to get it to start effortlessly. I think when it sits overnight the large Mk2 fuel lines I have made to fit allow the fuel to empty back out the swirl pot and carb basically by gravity. Well that's my theory
One thing I was thinking of changing next if I had further issues is the swirl pot as I have read about them rotting internally which like the filler neck can get in the system. I also was close to examining the fuel pick up as I know the gauze can clog. You can modify a fuel filter to put on the end instead of the gauze which eliminates issues from that end.
I now unfortunately have a number of issues with my clutch and exhaust but that's the nature of these old motors
Good luck and post up how you get on
. They seem to have mainly original parts.