so on my 78 monte im getting everything buttoned up on the engine swap and ive come to term that the carb that the guy sent with the engine is junk but ove got a 650 or 600 dont remember right off hand that is on an 81 cutlass i got that was in a rollover and it sat upside down in a ditch over night would that carb be any good ive tried to start the cutlass its on and it goes runaway like almost like a diesel would i just dont know if its the carb itself and that one junk too or if its something else and i can swap that one on to the monte