You could have blown a head gasket becuase i ran into the same trouble after the new rebuild and the motor nocked alot becuase it ad a peice of gasket in teh cylinder also the backfiring could be due to the car running the wrong degree on the distributor.... check out the head and what mine did it knocked and it sounded internal by the heads not so much the motor but it ended up smoking a bit and they were new head gaskets but they were installed right but the tourqing on the back head bolts was wrong (barely it was off by a few pounds)- these things are very tempermental) check out the timing first tho cuz u might be able to get all it to stop!
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89' GT with 5spd Hurst short throw, Keith Black 12:1 comp. pistons, Sealed Power drag racing rings, Fms F303 Cam, Ported and polished upper and lower intake with Ported E7TE heads that contain comp. cam double coiled springs with titainum locks and steel retainers, Fel-Pro Head Gaskets, 9mm ford racing wires, BBK chrome unequal shortys, Power Throttle bodies 70mm, Edlebrock 70mm EGR plate, 15inch K&N, Bassani X-pipe, Flowmaster 40 series, Eibach 1 1/2 lowering springs, Cobra R rims 17X9 with p235 on front and p275 on rear with Falken Zeix tires-RUNNING!
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