I'm doing an EFI conversion with a 1990 Mustang 302 with Pro Comp heads installed, but cant seem to get the shorty headers to fit. I'm using the original motor mounts, Zbar for cable clutch, and shorty headers for 1990 mustang. Do I need shorty headers for my 67 year car or the ones I have for a 1990 Mustang? I already have the exhaust installed and working with the manifolds. The length isn't the issue, its the width of the headers that are making a mess of things. I've already shaved down my upper control arm studs, pounded in the tubes that needed to be dimpled, but they just aren't clearing... Does anyone have any suggestions?