383 Stroker question

Ok just got a side job on a 67 Camaro. The engine is a Dynoed 383 stroker. It has been sitting for 5 years in a body shop and has not run. So I get it running and times 14 deg of inital timing runs great ands drives great then I pull in and park and it will diesel and switch directions for a few revolutions then stop. I went from 6 to 16 degre of timing but could the carb cause this diesel problem?? I pulling my hair out!!! Please help

High base timing and idle speed combined can cause this so can low octane fuel, set the idle lower and see what happens for starters.