72 camaro rear wheel question

[72camarors]

I have a 72 camaro and in the process of buying new wheels this next week. I had 20x9 and 18x8's before. I am running 20x10 and 19x8 this time. I have bee thinking about narrowing my rear end without using mini tubs or moving my leafs. I know I can still only run a 10" rear but I should be able to run a deeper dish. I was wondering if anyone has done this or if it can be done? Thanks