Help me confirm my measurements and back spacing thought

I can peel a set of 14" off my mustang only a 205 or 215 tire but can get some additional ideas for measurement and figment. The measurements I gave you are for the short side, the opposite side has an additional 1/8 to 3/16 to play with. I noticed last night the rear spring mounts the driver side is closer to the rail and the pass side is 1/4" further away from the rail. I guess the tolerances were a little looser. Lol. I also shimmed the driver side front mount back 3/16" may need to go 1/8" more but what I had at the moment.