Conversion back to EFI, from single carb Options

[billd]

I am considering converting my 73 2.0L back to D-Jetronic EFI. The PO converted it to a single 2-barrel progressive carburetor. I have a few questions.

Fuel lines. Currently there is no return fuel line and the PO has run the supply line with 3/8 copper tubing down the right (passenger) side of the car (not through the tunnel). The fuel hose on either end appears to be clamped directly to the copper tubing - no AN fittings.

My thought was to run a second 3/8 copper tube along the same path as the supply tube for the fuel return (sharing grommets). Is this routing reasonable? or should I relocate both tubes back to the tunnel? Is copper a reasonable material for this or should I use SS line? Is it OK to clamp the hose directly to the tube in a high-pressure EFI system? (This doesn't seem like a great idea to me since there doesn't appear to be anything keeping the hose from getting pushed off the end of the tube by fuel pressure). If not, what type of fittings do you recommend? I was thinking of flaring the tube ends and using AN fittings.

Component Locations. I have all of the pieces from the D-Jetronic that was removed: fuel pump, pressure regulator, rails, injectors, throttle body, MP sensor, control module. However, its not clear where they are supposed to be mounted. Can anyone point me to a picture that shows the original locations of these components on a 73. (Its pretty clear where the injectors, rails, and throttle body go, but the other components could be bolted almost anywhere).

Unit testing. While I'm hopeful that everything works, being realistic one or more of these 33 year old components is probably out of spec. For the fuel pump, regulator, and injectors the unit test is pretty simple, but what about the MP sensor, temp sensor, and control unit? Does anyone have an easy way to unit test them?

Thanks much for the help.