Possible engine swap for Tr6

["Ryan Kroelinger" <Rkroel@cox.net>]

        Hello all!  I am currently in the process of finding a Tr6, and one of 
my
main interests is swapping out the stock 6cyl with something more modern.
Is there a common engine that is used for this?  I have seen Supra 5 speed
transmission swaps talked about, is it possible to swap in a gen 4 or 5
supra motor?  The gen 4 uses the 5 speed so that seems more likely, but a
firebreathing 2JZGE or 2JZGTE turbo motor in.  I may sound crazy but let me
know what has been done.  Thanks a ton!
Ryan Kroelinger