Let me start off by saying, I'm new here and am lookin for a good experience! I know some people on here won't agree with what I'm wanting to do, but Im hoping to not get any negative comments about it. I'm in the process of turning a 62 4-door hardtop Catalina into a "new age" lead sled and am wanting to put 20-22 inch rims on it and have it sit as low as possible without havin to put air ride on it, yet! Anybody know how big of tires and what kind of backspacing I will need to tuck that big of a rim? Thanx in advance for any help!!!!