Just did 2 to 4 bbl swap car starts wont stay running please help

0 degrees of initial timing (at TDC with no vacuum advance) is way too low, that will definitely make the engine run very hot and make the headers glow red. You should probably be more around 10 degrees of initial at idle. How much timing does it have around 3000rpm (initial + mechanical no vacuum advance)?

When you took it for a drive, how did it feel? With only 0 degrees of initial I would assume it must have been lagging in power in a big way.