Rims and tires on dropped 66

[wright66]

I'm new to this, and I apologize if it has already been addressed. I have a66 chevy short bed that I'm bagging. It has a good 9"rear end and a 75 chevy front end to give me 5 lug disc brakes all the way around. It's also c notched with 2.5" drop spindles. I'm sure some one has layed frame. I'm trying to find out the offset on my rims that I need as well as any extra mods that I need to do to fit a 22" rather than a 20. Amy help would be greatly appreciated