goto
www.msefi.com megasquirt do it yourself injection.
For US$150 you build the efi controller, guys on the MS site are building partial harnesses, get the rest of the system - pump, fuel lines, engine harness from the junkyard. A little bit of wiring later to splice the 2 harnesses together and your done.
For under US$500 you can convert to injection. You will need a laptop to tune the system. As of last month their were over 7000 MS controllers sold. All the required tuning s/w is free on the net.
