I would have backed off on the duration to something like a 235/245 and in the 650 lift range. Would make the car more driveable. As far as the trans a well built 200r4 may last..a friend of mine uses Janis Transmission in Ohio...they have a great reputation with the Buick GN crowd and are a more dedicated shop than just a name on the transmission.
One question I have is what is your fuel system?
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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