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If its not the thrust block the housing my be bent.

So the 66-72 small bolt 8 3/4 has a width of 57 1/8" The same housing with big bolt pattern axles has a width of 57 13/16" Now the 73 and up big bolt 8.25/7.25 axle has a 56 3/4” width. So the difference between big bolt pattern 8 3/4's is 1 1/16" From my measurements the 8.25/7.25 width is...

I don't think there is any thing that a bracket at the bearing has to hold onto. The 8 1/4 bearing rides on the axle. You could put a lot of work into an 8 1/4 and use the 8 3/4 tapered bearings. The easy way to fix this would be to use a 8 3/4.

Your original housing most likely is bent. It is also possible that your replacement housing is bent. The wearing out of oil seal is a indication. A good shop that rebuilds rear ends should be able to check and straighten your housing. I made tools to do my own. Almost all rear ends are...

Your rear end housing could be bent.

Why not install a B-body 8 3/4? It is only a 1/2 inch overall longer. that means 1/4 inch each side. The difference can be made up with custom wheels . If you want fat tires in an A-body you have to move the leaf springs in to to the frame rails, and move the spring pirches on the rear end...