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Rather than switching the gear on the drive as Jeff did, we take the M75 shaft and simply shorten it and mill the distributor drive slot in it. We've done 5 like this. We also use the MOPAR electronic ignition system you can buy from most suppliers like Summit, then run it through a 24/12...

For that M75 engine, do yourself a BIG favor and put a civilian electronic ignition system on it. You can then run civilian plugs, but mostly, it will run SO much better. The GI is really weak. An Edelbrock 1406 carb is a must as well.