Here we go again. Its acting up worse this time!

Put her up on jackstands. get it running as well as you can, you may have to adjust the timing and carb to get it running enough to stay running on its own. Get in, sit down with the radio going and let her heat up and burn this crap out. Doing it on jackstands is nice because if it breaks down you dont need to recover it.

You may want to run it from a jerry can with a long portion of hose, you will find out if its the tank.