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did you happen to change harmonic balancers or timing chain covers while building the motor. I had this happen to me last year and it just about drove me crazy. The older 305's timing mark is in the center of the timing cover and on newer models its off to the side. I had an aftermarket timing cover with the tab on the side and an older balancer which would have matched up with the older style timing covers. I was off one wire b/c of this. Run that through your head and think about what you are working with.
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