We had an 89 TTA engine, headers and cross over. They didnt gain anything over the more common 86-87 Buick stuff. Best advice is to use the more common (and less expensive) Buick stuff and make a new pair of headers
The only thing really different with the TTA engine is the heads. The 3.0L heads will give a little more room and every little bit helps. I pretty well knew that the headers and DP would have to be custom fabbed. It really doesn't scare me as the results will be worth the effort. This H-body is my 11th so I too am familiar with the quirks/rust Good to know about the power steering issues. I will still try to make something work but the car currently has the manual box in it. This will be the project that never ends I am sure but it will be a fun one. I aint scared to cut the car to make things fit. Thanks for the help.