I had a 72 Catalina back around 1980, same color as the one in this pic. 400ci/400t. I think i paid 2 or 3 hundred for it. Beat the piss out of if it but it didn't care. I miss those big ole boats.
Used to do neutral drops while drifting backwards on a hill. It would go through all three gears and peg the 120mph speedo while still rolling backwards, spinning one tire, which would mean that tire was spinning over 240mph, and it wasn't none of that Z speed rated tire stuff either. Lol. Fun stuff.
P.S. Budweiser will work as transmission fluid in a pinch.