[Sean Marconette]

My 84 Mustang GT, I have 15x10 with 6.5" back spacing and started off with 28x9 slicks with a stock width 8.8. Definitely a balancing act and a big hammer. Unless you are building a stick car, I would not put 10" wheels on your build. The largest tires I have ever had on the car are 29.5x15. The wheels have been on the car since 1992. I moved some stuff around when I switched to SS in 2015 and it is not as tight. Slicks have never stuck out of the fenderwells. Front wheels are 15X4 with 2.25" back spacing.

As others have suggested, weld all rear suspension brackets or you will ruin the car. The best thing I ever did was to install through the floor subframe connectors. These cars twist and crack sheetmetal if you do not address these items. Weld the tubes to the center section as Rory pointed out.