I am about to order some wheels for my 65 4 door Buick special. From all the reading I've done I am pretty sure a 20x10 will fit the rear with 5.5 back spacing and no mods. I'm looking at some 20x9.5 5.25 back spacing for the rear and 18x8.5 front with 4.5 back spacing. The rear is stock with worn springs, the front will be lowered 2". Any recomendationsfor tire sizes? I would like to run a 40's series on the back if it will fit.