I've installed several of the DSE Selecta-Speed kits on customer's cars (66 Chevelle, 69 Camaro, 67 Nova) & have sold quite a few. I installed one on my daily driven 65 and love it. Had to make a small adjustment to get it to clear the driver's side defroster duct. I'm going to install the DSE kit on a 67 wagon I'll be driving while I upgrade the 65.
Walt