Magnum exh manifolds questions

I use a set on a 66 Barracuda last year I know the post with some pics are on here. I just don't know how to find it to copy it here. Anyway I had them milled an 1/8 of an inch on the mating surface to the head both sides. I also cut off the casting on the passenger side that look like it was for an emission hookup but was solid. If you have a 90 degree oil filter adapter you must remove it and use just the regular plate. On the drivers side I had to modify the top part of the flange where the pipe bolts on. It's thick if I remember right I removed approx. 1/2 inch from there just on the side closest to the firewall. I shimmed the motor 1/8 on that side also to clear the steering joint,eventually I replaced the stock joint with a universal joint. I don't think you should have to do as much to the manifold as I did as your car is a bit wider than mine. I also ended up removing about 2 inches from the steering column tube.Mine is a floor shift so that wasn't to bad. I did use manifolds off a 99 5.9 magnum. I hope this helps .