Killer project! Gonna be a screamer! As far as gear ratios.....quicker, cleaner and easier to change transmissions than diff gears. If you have a spare Muncie or two (with the same input & tailshaft), they can be swapped/tailored to your combo in an hour or so. Make sure you degree in your bellhousing for those high rpm flatshifts.......but you already knew that.
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