Check out my site for some details about the conversion.
Home of the KERR BROTHERS!
We had a donor car so all the parts were there. Ya need to put the EFI fuel tank in, fuel pump, filter, fuel lines (return line, but we put both in), then the rest is pretty straight forward.
Pull the old motor out and take the trans off, change over the flywheel and clutch (you'll need a spigot bearing, but ur 173 should have one in it), put is all onto the EFI motor. On the end of the crank it has a dowl which needs to be removed, otherwise the flywheel won't bolt up. Once all that is done drop the motor in the car. Strip all the crap off the EFI wiring loom that u don't need, then plug it all in, and run the EFI harness back under the dash and plug it into the computer, make sure u also connect the tachometric relay, coz without this nothing will work. Run wires to the fuel pump, and the neutral safety switch wire just splice that into the purple starter motor wire.
Check out my site for a bit more info on the wiring, and my forum also has some info too from when I was asking questions about the conversion.
Pub24/7 and HDT202 are the ones who helped me through it. You can find them on my forum, or prolly better to contact them on here as they'd be online more.