I opted to pull the distributor because I couldn't get a good enough grip on the slotted pinch bolt screw. I turned a spacer up so I could replace it with a 1/4" hex head bolt. While I was in there, I replaced the well-worn ignition points and condenser.

I was putting the distributor back in, and wiggling the motor back and forth to get the distributor to engage with the oil pump, when I made the realization that the motor is turning over a little TOO well for an engine with the transmission in gear! I'll focus on getting the motor running to confirm it, but I'm thinking a new clutch is on the horizon.

Looking on RockAuto I found a couple of clutch kits with the part number MU54731B and MU90911. Will either of these fit my 261? It has a five-speed transmission.
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1959 Canadian GMC 9600 with a dump box
Intro / Details in Big Bolts