Wheels and Lowering my 71 BBC C10

[*hotrods*]

Hey guys, I don't post on here much but just thought I would get some opinions on some things. I recently repurchased my old 71 Cheyenne shortbed factory 396 with 12 bolt and leaf springs. Its a black truck with houndstooth interior. I'm wanting to lower it and put some 20" wheels on it. I like the Boss 338 chrome wheels. I was considering doing a 20X8.5 on the front and maybe a 22X9.5 on the rear. Has anyone run this setup and if so what tire size did you go with? I'm thinking about doing lowering blocks in the rear a a drop spindle with a lowering coil in the front. I'm not sure if I can go with more than a 4" block and be safe but I want this thing to ride low but I dont want to go bags either! I greatly appreciate any help guys!!!