Hey guys! Had a couple of questions about what tires to get for my dad's Impala. Its a 1967 Impala SS 427 with the 4 speed transmission. Engine has around 15k miles in total, all matching numbers! The only problem is he has some cheap 13X6 rims with 185/70/R13 tires, and the car loses traction just driving normally. So I got hime a set of rally sport rims, 15X7 on the front, 15X8 on the back. What size tires should I get for this old muscle? I'm not to sure what to get as I am more of a JDM fan owning a '90 GT-R myself. Sorry for the life story, and Thanks far any help!!