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Same thing happened on my 78 5 speed when the drivers side cam broke. That's the worst possible scenario. Did the backfire go through the intake or exhaust? If through the intake, look for blown vacuum hoses including the 8 connecting the spider to the upper plenum. If it backfired through the exhaust, look for something that would cause an over rich A/F ratio such as low control pressure or high system pressure. If the timing belt is correct with the crank at TDC and the notches on the belt line up with the pointers on the cam backing plate, turn the engine over and watch for a wobble on the cam gear. This would indicate a broken cam.
Dennis
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Dennis
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