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"...The '71 motor will have a 6 bolt flywheel..."
If that's the case, do you know if by 73 B20F is 6 or 8 bolt?
"..It could be a substantial performance upgrade for your '73 motor..."
No doubt. The problem is that I don't know the condition of the '71 E motor. For the time being I will stick with my '73 F motor as I know it ran good (15+ years ago). I would also expect the F motor to be more tolerant to the crappy gas we get now. Being the king of cheap, I hate the thought of having to use 93 octane. Although, if higher octane allows more spark advance the peppier response and higher mileage may offset the extra cents-per-gallon for 93????
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