I run 28x9x15 slicks on my 66, or for the street I have 275x60x15's on centerlines, almost identical size between the slick and the 275's. Stock wells....I have heard it's tighter on the coronets, not sure why. If I remember correctly, they list the coronets at 117" wheel base and the satellites and belvederes at 116" so the the coronets are longer wheelbase.