If you are going to install green bearings, I'd get the new replacement aftermarket axles which are made just right for that to A Bodies Small bolt pattern conversion to big bolt pattern removing the thrust block. Doesn't make sense to keep the original ones converted.

A friend of mine BELIEVE IT OR NOT, cut the hub from B body axles donor, cut the hubs from his own A body axles and installed the ones removed from the B body ones. He made splines on axle to fit the B body hubs by pressure and also seam welded those. He ran at 1/4 mile races for long time with that on his 70 Swinger.

That's something tipically done down here when fixing heavy duty trucks axles.

Just an idea if you wanna try it. Can't tell the cost of that kind of job up the or even if you take care of doing that.