Quote:
Originally Posted by ronnyT
Yes vacuum advance is plugged. It is a brand new msd dist and a new holley carb.
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recheck the wires make sure the are in order , get a timing gun if you hv not already , your timing is either to low or to high. I cant remember if its backfiring thru carb, or thru exhaust , 1 of these is an indicator of low timing and 1 is an indicator of high timing