I used to have a 78 Zephyr Z-7 that I put a 5.0 and 8.8 from an 88 Mustang into.It also had a C-4.If you are using a roller motor and a duraspark distributor get the right gear, the double hump crossmember will fit if you cut the tubes down to the same length as the Zephyr ones,the 8.8 fit no problem and I transferred the brake lines over from the old rear so I didn't have to change anything there, the stock h-pipe from the Mustang with the cats hit the floorpan of the Zephyr so I took the upper cats off and replaced them with straight pipe.The stock k-member seemed a lot heavier than the later Mustang ones, you might want to change it down the road with something lighter.Every thing else was mechanically the same as a Mustang.