I bought one of these way back when they were cheap. Seller was good for me, I bought quite a few tools from them. May want to contact them and ask for complete pictures to see what is included. Doesn't take much for a 6.9
https://www.ebay.com/p/20007203812?iid=383708214490
I think I did way back, just couldn't go back in the same way w/o bumping gaskets. I didn't need picker back then, more braun than brains at the time. Never again.
How does the wiring harness look at the connection plug over passenger valve cover since it is an '86
Also check for burnt wires behind fuse panel forward of E-brake pedal
ANY new idlers I replace now, I pull a bearing cover seal and pack with anti-friction grease or equivalent and replace seal. Most have minimal grease in them from all the manufacturers it seems. Has made a difference for me.
Get some belt dressing, or something similar, and put on belt back. If squeak stops, it is belt. If not, pull belt and slowly turn each idler pulley by hand. Should be no resistance turning the pulley.
Bad VP would have been masking the noise earlier.
Only other thing I would think is the starter not spinning fast enough. I changed to a DB Electrical Denso type/copy and spins much faster. My old 6.9 ''bump' starts especially when warm. Got away from the Mitsubishi style. I keep an extra on hand since 2 ship for same UPS charge. I think...
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