Well I can tell you I put a 322 in my 54 Ford (back when I was stupid) using the ford trans. The ford trans was designed to handle 15 more HP and a bit more torque than the Buick trans is. I blew up 5 trannys before I sold the car (with a blown trans). I could clean every tooth off the input shaft just by stomping on it in first gear. If you are looking at 250 HP you should be also looking at a Century or Super trans. The special trannys were not designed for that much juice.......Bob
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Bob Beck
39 Chev PU
69 big block Corvette
55 Buick 66C
57 Buick 46C
55 Olds S-88
56 Chrysler St. Regis
AACA, BCA, WPC, USHGA