hey guys i wanted to know if any1 has this set up of a 15x8 rally with a MT street radial 275/60/15 on a 69' camaro with a hotchkis 2" drop in the front and 1.5" in the back, if so whats the best offset on the back for that combo with no other suspension mods.

I have that exact tire/ wheel on my 68, and I seriously doubt it would fit a 69 with any drop, it fills up my wheel well pretty well and a 68 has more to work with.
I cant guarntee one way or the other, maybe with a perfect backspace but IU doubt it. Mine is 15X8 w 4.5" backspace, for what it's worth.