5.9 Magnum into a 73Duster

OLDGEEZER,
A good friend of mine in MN did his a couple years ago, and he loves it! recently He had to replace his tank sending unit. He found a NAPA replacement that was 3/8 line with a fuel return nipple. I just phoned him but no answer. Check back, I'll try and get that part# from him for you.
I went the route of the MoPerf 390HP Efi kit in mine,so I'm no help on your swap, but my friend might be willing to talk to you about his.
He did say that he used as much of his 1970 wiring as he could and the hard part was finding out what wires he could get rid of from the truck harness. I think he finally got it down to only a Pos and Grnd for the comp. and then modified the wiring for the charging system.
You most likely need a year specific wiring schematic, :study: cause some of the color codes change year to year.
Both of us used the new serpentine belt/alternator and ran the charging wire direct to the Batt. We both still need to convert or modify our ameter/voltmeter to get a correct reading gauge. that hasnt stopped us from drivin tho. :rock: