[randy deel]

ok i got this lt1 94 firebird 5.7 off this guy and he told me all the car needs is a starter then it will run well i got one and it still would'nt start so i put a new coil,controll modual,spark plugs,disrtibutor and cap ,fuel filter,for the car and after i put the distributor on and then when i put the distributor back on it back fires through the exaust.would the key switch have any thing to do with it or the timing. someone please help asap.