Where is the weak point
Here are some pictures that show some potential problem areas. The A-body transmission mount holes were always in the same location regardless of year. B bodies have a more rearward mount in '64-9 and there is only one shifter mount location. This shifter mount is in line with the upper hoop of the torsion bar crossmember on an A-body so it can't be used. The shifter mount lugs are usually partially ground off to clear the crossmember. The '70-later dual shifter mount tailshaft housing is the one that is usually used when a B-body A833 is used in an A-body since the rear shifter mount location can be used. There are 2 sizes of flanges for ball & trunnion transmission. They were there when I was taking pictures so I included them.
Here are some pictures that show some potential problem areas. The A-body transmission mount holes were always in the same location regardless of year. B bodies have a more rearward mount in '64-9 and there is only one shifter mount location. This shifter mount is in line with the upper hoop of the torsion bar crossmember on an A-body so it can't be used. The shifter mount lugs are usually partially ground off to clear the crossmember. The '70-later dual shifter mount tailshaft housing is the one that is usually used when a B-body A833 is used in an A-body since the rear shifter mount location can be used. There are 2 sizes of flanges for ball & trunnion transmission. They were there when I was taking pictures so I included them.