Newby from Washington state

[Noquarter4you]

Hello all,
I'm new to this site and the c10 world. I just brought home a 71 chevy c10 with 72 thousand original miles. Not perfect but a damn nice truck.

So my first question is it has I guess corvettes rallies on it. My wife has convinced me to keep them. I have a brand new set of 325x50-15 and 215x70-15s. I would like to run 15x6 on the front and 15x10 on the rear. What is the best offsets or backswing to use with this tire combination? Also plan to do a 2 and 4 lowering kit on her. Any help would be greatly welcome and hello to all.

Thanks