anyone used hooker fenderwell headers

yes they're fenderwells, the instructions give measurements to cut the holes (although reviews say the holes are way too big). if they'll work on my 68 valiant i'll probably remove the inner fenders completely and add tube braces to support the chassis (the car's going to be a gasser with a straight tube axle). i was more interested if they'll fit a 67 up a body really as they're quite a chunk of cash if they don't.
cheers, neil.