Standard manifold with Falcon CPI ea throttle body.

See here -
http://www.retrotech.co.nz/Tech/throttle-body-injection.phpSimon ran a couple of adaptor plates however it is just as easy (and cheaper) to slot the throttle body base. It then fits straight on.
The throttle body and fitment is cheap. Easy to grab an elec fuel pump, run lines and surge tank. The expensive part comes when you want to control it (ECU) depending on what you get this will cost more than the rest put together, and then there is the cost of setting it up on the dyno. MegaSquirt is probably your best budget option. Still it can be done cheap. My first injected pinto used a screwdriver adjustable Microtech D4 !!!!
Other options are the Sierra/Granada injection manifold and ecu.
Getting harder to find now, but usually between $500-1000 for manifold/ecu/loom/dizzy. Will bolt straight up and run, can be made to handle 'some' boost with a few tweeks. Probable most cost effective in the long run as you dont need dyno tuning to get you up and running.
Adapted inlet from another make. I have seen volvo, saab, telstra and falcon all with varying degrees of sucess. Need to be handy with fabrication and will still need dyno setup and (mostly) custom ecu to work.
Or you can go full custom. i ordered all these parts via ebay for less than the price of a bare sierra manifold. Again, you will need to factor loom sensors ecu and dyno time.

Shaun