so i just got done installing my 355 into a 1978 volvo, we are trying to get it to fire up but all that happens is it ends up shooting flames out of the carburetor. the car has gas and spark, and it sounds like its only firing on one cylinder. we set TDC and got it all lined up. what would cause it not to fire over or even worse, why is it jetting fire out of the carburator? could it be the cam is off timing?