72 340 - What Did We Miss

I do not have a '72 FSM, these are from the '70 version & I was off by several degrees with my last comment.

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This only works if the distributor is clocked like an OE distributor. I've seen OE distributors not cooked like that and countless aftermarket distributors. The rotor can be pointing at 12 o'clock and the drive is a 9 o'clock.