GV:

Looks like no experienced person is going to respond, so I'll stick my nose in.

Start the engine after opening the low speed needle a bit more, then play with the throttle and the high speed needle until it will go. Then just richen it a bit off peak and continue your run-in on it. After you have ten or fifteen minutes on it, start slowing it with the throttle, mess with the low speed needle to get it smooth and responding well.

Regardless of vacuum leaks you should be able to run it at speed, if you do have problems trying to get it to stay running at lower speed after getting the high speed close, pull the carb and backplate, seal them with the RTV we were talking about before. That should cure your difficulties.

Bill.