Zach,
Welcome aboard. I'm in Huntington beach. I go to Perris Valley to skydive all the time. What city are you in?
That Imperial Storm Trooper car looks sweat. Call Turbo Lou. He may have a PS res laying on his shelf.
That Richmond gear will always whine like a (thinking of something political to say but not offend too many people).

Only way to fix it is to replace it with a GM gear. I use J and S gear in my home town.
Check in the South Western section. We've got some cruises coming up. It's good to meet other Buick people. You'll get in the loop for hard to find original parts. Also see what others have done to their cars.
Congrats of a great looking hot rod and hope to see you at a So Cal get together.
Happy spooling.
Mike Barnard