15x10 wheels on lowered '77

[wardee1977]

I recently purchased a nice '77 shortbox 2wd. I am going to be lowering it this winter. I am probably going with a 2.5/4 drop kit. I want to run 15x10's all the way around with 295/50-15 tires. The wheels I have been looking at are a 4" back space. Just windering if I will have any rubbing issues or if it is possible to go any lower. Say like a 4/6 or a 3/5 or something like that. Thanks very much for any info, and if anyone has any pics of a truck like this, please post.