Glad to hear your recommendation! Another Firebird enthusiast John down in San Diego, who has helped me out considerably. Also has done it and loves it! I’m going with 350 gears in my new rear end and the 0.71 overdrive. My car was all original, it was a one owner that I bought in an auction in Oregon 10 or so years ago issue I had when I submitted everything to PHS. It wasn’t documented so it really didn’t matter so I decided to make a lot of changes, unfortunately before I found this out, I did sell a numbers matching coupe that I had bought off an Indian reservation in Bishop California That went to somebody I believe in Montana. Can’t wait to try everything! Big issue I have right now is I can’t get aluminum heads for about three months so I can’t complete my engine.