Check out Binderplanet.com. Theres a man there that sells the adapters and parts to do it, or tells you how to do it yourself.
Bill-USN1 at Hamilton fuel injection is the guy. I'm working on TBI for my 50 GMC now with 270. Good luck. Jim.
http://www.binderplanet.com/forums/showthread.php?s=7e36c724b03a49851322e7cc96e2bf68&t=47254