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The thing is toast. Pull the flywheel and have it resurfaced. 2 options on the clutch. put in a 12 inch clutch out of a 1-1-2 ton truck with a v6. Thats what I do on both gmc and chevy. I will put some pics of these on later after I go to the shop. Second take your clutch to the napa store and have the counter help compare your clutch to a chevy, buick ,pontiac. 11 inch clutch. Tell the guy you want to see a clutch for a 76 chevy 3/4 ton 4x4. He should have that. Compare the disks. they will interchange. There may be some visual differences depending on who made it, but that wont mater. Now the pressure plate is where you have to get creative. First the distance from the face of the flywheel on the gmc v6 to the mounting surface of the trans is aprox 5.75 inches. on a chevy with a truck flywheel it is aprox 4.75 inches. Now you see a range of measurements in the B,O,P. also, so there is a range of thicknesses of the whole pressure plate assembly, with gmc being the thickest. These differences are dealt with in a few ways. Ball stud height, and throwout bearing changes in conjunction with pressure plate thickness, and release finger design. The reality is you can see thicker pressure plates in the narrower dimension and thinner pressure plates in the wider dimension. Nothing has to be custom here. Especially the disk. Now finally in regard to the pressure plate. If the plate is not deeply scored you can resurface this also. However you need the services of a nice machinist. Barry
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Now that's the kind of info I like to see! Another V6 guy used a diaphragm set up for a Chevy and an old timer told me the same thing. Since I have never personally done this I wasn't going to chime in.
However... I am going to the parts store in a few and I was gonna drag the clutch from my parts motor with me to compare it to what's available. I am running a Hydramatic but I have been curious about this.
I guess the leg work has already been done!
I put the large clutch in my 61 Chevy wagon with a 3 on the tree. The older fellow behind the counter assured me it would work and it did.
Pep I have a bell housing sitting by itself. If some pics would help you to figure out if you missed a bolt lemme know. I also have two flywheels if yours is too far gone. These might be toast also, never really checked them out
I removed the clutch/flywheel the same way you did, with the bell housing still on. I had the engine still attached to the hoist but sitting on a tire on the ground. When I got all the bolts out of the flywheel I thought I had the full weight of it in my hand, but it was actually hung up on the tire. When I pulled it away from the engine it slipped off of the tire and pinned my hand against the ground. Blood spurted like a horror movie!
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My hands were black as night from all the grime(I'm not using these parts so no hurry to scrub them) and the blood was quite a contrast. It split the lowest section of my pinky wide open and left teeth marks across the callous part of the next two fingers.
I thought it was gonna be a trip to the ER but by the time I got it cleaned up it wasn't bleeding, just oozing clear fluid. I taped it real good and ignored it. Even a week later my coworker was telling me I should see a doctor but it is fine now.