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Blue cap was probably from someplace like Pep Boys. If it fits both distributors, they are both Bosch.
The Volvo/Chrysler ICUs are the same. Round plug is supposed to be "early" ('81/'82?), so I'm a little surprised it came from the '83 sedan.
If I understand your post, you're using the sedan distributor (round plug) to match the harness plug and ICU in the sedan. That sounds like agood idea. Make sure the plug pins have "sleeves" on them for good contact.
This ign system sometimes fails to deliver a full 12 volts to the coil primary #15. As a test, run a jumper direct from the battery and see if it starts. Put a meter on #15 while cranking, if you have one.
Also, you can check for spark with the D-cap off. Rotate engine so an open "vane window" is in front of the Hall switch. Then, with key ON, simulate the rotating vane by running a feeler gauge blade past the hall switch.
This should cause one spark, and the fuel pumps should run for a second or two. Try it a few times.
Let us know if these two tips help (or not)
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Bruce Young, '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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