Thanks for the tips. Some cracks in tubing at the Tee fitting. Tried plugging the primer ports on the carbs with another piece of tubing with a 10-24 machine screw in the end. Turns out that is a rather crappy seal. Took apart primer plunger, regreased o-ring. Re-seated the check ball, replaced 1/8 tubing and it seems to have fixed the surging idle. Took a rip down the street seems pretty good. Just happy to have it move for the first time in a long time. Probably will go through carbs soon just to be sure. It was stored dry, so it shouldn't be too bad. Thanks again for the replies, glad this site is still here 10 years later.