300M input/intermediate shafts, 34 element intermediate sprag, specific frictions and bands. And a stout billet torque converter. 80's are pretty tough. Actually I believe that the most important part is blueprinting and calibrating the trans so that it shifts quickly. 80's tend to shift lazy. Blower/Turbo engines accelerate super quickly. If the trans takes it's sweet time shifting, you'll end up against the rev limiter regularly. So the builder is just as important as the parts.
http://www.bowlertransmissions.com/i...ils.aspx?iid=9
We just ordered a new valve body from Bowler to speed up the shifts in one of our house cars with a Hughes trans. I hope it helps.