8.25 Swapping gears to Abody Unit

i'm about to drop 3.91's and a OD into my 65, the gear calcs work out pretty decent for what it is.

avoid the 3.23 + OD, that's gonna be a bummer everywhere except 1st gear.

if you're talking about a swap-a-roo of the 3.90's onto the 3.23 SG carrier, yes it can be done.
(caveat as long as the spline counts are the same-- which they should be)