/6 runs great, randomly stumbles and dies...???

Final update. Installed new tank and new sending unit today. Problem appears to be fixed. I couldn't believe how corroded and crappy the old sending unit was. It was partially just gone. I'm surprised it worked at all, I shudder to think what sort of crud it was throwing into my new carb. Doesn't ever die now. I drove it around all afternoon with no problems at all. Last time I don't check this out immediately when getting any car that's been sitting!

Thanks FABO members. Case closed!