junkyard TT setup?????

[DeltaT]

The sizing is pretty consistent, because the Buicks are 3.8ltrs (241ci) and your's is a 460ci (7.2ltr), so each turbo is handling pretty close to the same displacement as stock. There are a couple differences, such as the Buick turbo is pulsed by 6 cylinders, and each of yours would be pulsed by only 4 bigger ones - the pulses would come less often than with 6, but stock turbos are usually pretty small.

I'd go for it!

I highly recommend Corky Bell's book on turbocharging, "Maximum Boost!". Talks about sizing, sytem layout, etc. all the stuff you will need.

Jim