If you’re planning on more mods (clutch fan delete, aero mods, etc) then I’d do the 3.27FD and then add the other mods to make it easier to hold speed... the steeper grades could be handled in 3rd or 4th gear...
Then again, if you switched to P&G with engine off, you could eliminate the need to re-gear... my car has a 3.84FD and I average 45+mpg usually
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My current Ecotec project...
My last Ecotec project...
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