Well, you certainly won't need tubs with a 61" rear!!!! Must be from a sedan.

"Typical" rear width, flange to flange, on a "normal" '32 rod is around 56" (+- 1/2"), with wheels that have around a 3 1/2" backspace. Figures need to be somewhat flexible because of differences in body configuration. You should probably set up the body and frame, then determine what axle width/wheel combination will fit best. Jag rears are narrowed with regularity, so it's not a deal killer to get the 61" unit. And if you have to tub the body to get the wheel/tire combo you want, you'll need to "pinch" the rear rails too since they fit right up to the back of the wheel well.