275's on a dart sport

I thought that's what you meant but I wanted to be sure, thanks for all the info it definitely helps me get a better picture of the rear wheelhouses on the Barracuda's. I have a pretty good idea what will fit on the Dart and Duster bodies obviously, but not having a Barracuda that's the one 67+ A-body I don't really have any measurements for.

Right now the bottom of the skid plate on my K member is 5.5" off the ground on the Duster, which puts my Doug's header flanges at 4". I ran my Challenger as low as 3.5" to the header flanges for awhile, although I've raised it back up to about 4" just because speed bumps were kind of a pain. I'd like to get the Duster down to 5.25" to the K and 3.75 to the flanges in the front, I may change over to the TTI shorty headers to pick up some more clearance to the flanges and run the Doug's on my GT. But I'll have to roll the fender lips in the front and the quarters in the back, plus removing the bump from the wheel tub before I can go any lower.