so i got a 93 1500 donner truck put that 350 in my blazed and all is well now I think My head gasket was blowen but not to the point to were my oil was changed or colent berning

 

If it's TBI check the wiring at the injectors. They are known to wear and go bad. GM makes a pigtail to replace them with. Figured I would mention it as I have repaired quite a few and it happened to me once while driving back from lunch..