Thanks guys, you are making me feel better about the decision on the exhaust, after all, given the total project, it is a lot of money and I would hate to regret it. Thanks again for your feedback, I can't wait to hear the exhaust and feel the difference with the tightened converter.
Now on to the install. At first, I could not understand what was going on. With the Gear Vendor adapter on the trans, EVERYTHING was too high. The headers were tilted up, the engine lost some of it's tilt and of course the flange that mated the adapter to the overdrive unit was flush against the driveshaft/transmission tunnel. Careful inspection revealed that the position of the trans mounting point was lower than the same point in the stock tailshaft. This was causing the whole unit to be too high, causing the interference and misalignment. Everyone has had to deal with this, modifying the crosmember & mount, extreme "massaging" the tunnel excessively, etc. What I did was take the stock mount to a good friend and customer who built me a new mount 5/8" shorter than the original. It took him about an hour, including painting. To look at it, you couldn't tell it wasn't original except the rubber was not in the middle but instead we used a piece of 80 durometer urethane on the bottom. With this installed, everything aligned PERFECTLY! The 5/8" at the mount equaled 7/8-1" at the flange/tunnel, plenty of clearance!
I just couldn't beat the perfect floor pans of this car unmercifully, after all, it has been a good car for a long time. LOL.