I just installed Doug's roundport headers on my 68 GTO convertible. I would assume the crossover is in the same position on my car. I did not encounter the problem you are mentioning. I did my own installation. I had a cheap set of flowtech headers on my car prior to the Doug's I also had a custom fabricated 3" X pipe that I was using with the old headers. The X pipe did not line up with the doug's headers but it was within about 2". What I did was cut off the 2.5" part of the reducers and cut a 6" section of 3" pipe to weld onto the reducers. I held this in place and cut off each side of the X pipe at the correct length. I held that X pipe in the best position and then tacked the 6" sections of 3" pipe to the reducers. The pipe was installed at a slight angle to get the best positioning. Once I had them tacked I took them out of the car and fully welded them, then used a die grinder to remove any remaining restriction in the reducers. I connected the "modified reducers" to the X pipe using strap clamps. There is a slight angle where the pipes join but this does not create a problem with the strap clamps.
Unless there is something severely wrong with your headers (unlikely since Doug's seems to make very high quality headers) I would think the proceedure I used, or a slight variation of it should work for you. Let me know if you need a better explanation.
Good Luck, Joel
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