[rwhite65]

My car has full length headers on it also. I wish I could tell you the brand, but they are one of the only parts that I actually left on the car that came with it when I bought it. When I added an AOD to the car, they did not clear. Since nobody makes full length headers for this swap and I wanted full length, I put the tranny in anyways.

In my case, I was able to bolt the headers all the way up, then wedge the AOD in.....took it to a local muffler shop and with the use of a torch, and a couple guys pulling and pushing on a 8 foot metal rod, we "customized" them to work pretty good.

I would try this before buying new headers, unless the ones you need are fairly reasonable.
hope this helps,
Ryan