Never on a B-body, but I've used the 2.5" and 3" kit on A-bodies. Both kits fit with no problems whatsoever. The only thing I'd recommend is to add an h-pipe. Other than that, well worth the money

1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser

1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)