junkyardhero said

my 68 dart is the same way-- a little tighter on the one side than the other. it's just production tolerances from when they're built.

1- 245's is about as big as you can go with "production/factory" parts-- ie stock a-body 8.75, big bolt brakes, 7" rim with 4.25 BS
2- the offset of BBP axles and discs add to the width. if you didn't account for this then that would likely be the difference and why you're having fitment issues.

possible remedies:
>roll the wheel lips, maybe push the sheet metal out a hair
>smaller tires
>rims with more offset
>reset/reposition the axle

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RedFish said

Knowing the driveline is offset and not down the center of the body,,, get a pencil and draw a capital I on its side but skew it's center line like the driveline. You should see that the short line representing the rear axle needs to be shifted toward square to prevent severe dog trot. There isn't a difference in length of doors, fenders, side to side. Thus tires in the wells are not the same side to side.
So it's not just your A-body or some A-bodies but all of them.

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