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'62 and '63 have the narrowest housings of all the B body's. 1964 being the widest. I've seen '64 and newer axel housings under the '62-'63s. You have to use a stock wheel or even a reversed wheel.
Section 1: Thrust Block Variations
There was a difference in thrust blocks prior to 1964 that make center section interchange, as well as axle interchange problematic. The thrust block, or “axle shaft thrust spacer”, it thr block that both left and right axles butt up against inside the center...
The different center sections will swap. If you have an open rear now and use a limited slip you'll need the shorter axles. They're not that much shorter, the ends of the open rear axles can be machined or even ground off. The amount taken off slips my mind at the moment.
My '62 with 275 60 15. 8" rims. The tire measures 10.5" across.
I once had a Black '64 Polara 500. I had Cragar SS all the way around. 10" on the back with H50s. Not sure how that equates now days but they were fat!
I had a wheel weight rubbing the upper control arm. I didn't realize the rim was that close. These wheels were 1987-89 chrysler rims, 15x7, 4-1/4" backspace.
I believe your couplers might be in different locations to one another. If you either pull them or push both of them to their limit or measure them from the hole in the side of the shaft you'll find they are the same lenth.