Leave the gear change consideration out of the equation.
It’s far easier and cheaper to change tire height to fine tune the gear ratio.
If the axles for now are usable in the local 12 bolt I would go with stuffing new parts in that if it will bolt right in.
If your RAII heads are not heavily ported I don’t think you will harm the 12 bolts stock axles without slicks and a lot of runs.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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