Please help me figure out Backspace for B body rear in Duster

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SRT_DSTRHOLC

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I have a early model B Body rear in a Duster. I took some measurements and I want to know what it will take to run a 10.5 wide wheel without hitting the front lip. I know mini tub, but I want to know which BS will be best overall.

The measurements I took are as following:

8 inches from inner lip to face of Drum.

4 inches from drum face to outter lip

12 inches from inner lip to outter lip.

I want to run a 295/45/18 in stock tub or a bigger 28in tire in a mini tub.

from the springs to the front face of the drum is 7.5-8in, so would a 7in backspace work?
 
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