They are now building 200r4 that can withstand over 500hp. My friend just put one in a 80 T/A with a built 455 pushing right around 500hp and the 200r4 he installed handles the hp with no problem.

I am with Bjorn on this one. With the cost involved, a person would have to drive their car like we do, daily in order to recover the expense. I see people do this stuff all the time, as well as the Tremac conversions etc. unless you plan on driving across country, how will you possibly recoupe the exepense?