There is no reason why it couldn't be done, I have seen pics of 140's with 20v turbos so the principle is roughly the same, assuming you are handy with electronics. Tuning the existing B30 or the swap would both be interesting upgrades, Its nice to see a different spin on the older models, particularly if it means a vehicle otherwise unused is put back in the road again. The Retro Rides forum can be a good source of inspiration. Good luck & keep us posted whichever option you choose.
http://www.youtube.com/watch?v=4ywCEXuvTF0