Put a little more pep in the trans while its open and ya won't be sorry, if done right you don't even notice till you get on it. I actualy wish I went to a 10in with 2500 stall, went shy n got the 12in 2200 stall which isn't even noticable till you flash it then its smiles oplenty, one of the best mods Ive ever done still.
Welcome, Deuce! Where dd you locate that '70 Buick Estate? Guess it must have been local to you since it was a trade. There's a guy in Orange County, CA (where I was until last year...) with one of those, that he was trying to sell. Kept throwing it up on CL once in a while. I think he was feeling out the market. Seemed to be in pretty good condition, with a good amount of equipment (PW, A/C, etc..) I think his price was 5 or 6 G's........