[speeder]

I second the advice about going through the maintenance process methodically under the hood and saving the carbs for last. The whole thing should not take more than a couple of hours. Doubtful that valve adjustment or timing has anything to do with your high idle but it’s still the correct order of things.

I have an MGB manual with a section on SU carbs that is probably general enough apply to yours, shoot me a message if you want me to read it to you or take photos of the page? They are easy to set and of course have diaphragms in them that you need to check…if they are old and dried out, one could be torn and that would cause a vacuum leak, (I think?), that might be connected to the high idle. ATF works great for slide oil, if it’s been sitting forever, they might be dry? That could also cause sticking and high idle. It’s important to have the correct amount of the correct oil and type, its measured by “rate of fall” when you unscrew the slide, lift it and let it fall.

Lmk if I can help, they are simple.