68 Dart Minitub with Offset shackles question

No sense doing a 3" relocation unless you minitub. You might get an extra 1/4" to work with vs. the 3/4" spring kit. As mentioned, the spring is the first point of interference even with the 3/4" kit.

You can get a 275 tire under the car with the 3/4" relocation kit. You will have about 12" of well to work with. If you want to go wider, then you should do the relo/minitub.