lol... good luck mate, its an interesting drive...

the os18 doesnt seem to care too much about the weight of the gears, its more the ratio that u are running - the gen gears are smaller than the stock mt ones, so it will loose some acceleration thru that mostly. also as u will want to use 11/15 pinions, u may well have to shave the brake block to clear the flywheel.

good luck in finding some steel spurs that small that will work with the cen mounts... might be easier to make or mod some mounts so u can use ofnas steel 11/15 bell - just a thought