So anyway, when you get back from Badweb (the XL Forum may give you some more useful info), you are going to need to do the following:
Mounting the carbYou will need:
intake seals (26995-86A)
a manifold (27004-88A)
a carb seal (27002-89)
a carb (they come up on EBay)
a carb bracket (29481-98Y)
a few gaskets for the bracket (29059-88A)
a few 1/2" UNC x 1/2" long allen screws to mount the carb
You will need to face, drill and tap two holes 1/2" UNC in the bosses in the casting on each head.
Getting the ignition to workYou will need a VOES (Vacuum Operated Electrical Switch 26555-94)
You need to wire the vacuum operated switch as per the link I gave you above.
You will need to wire the ECM as follows:
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The ignition timing table should be set (as a starter) as the link above.
You will also need to null any tables with affect the ignition timing, but you are a long way off that yet. When you get close I will show you what to do.