Carl,
What I was thinking of trying is to remove 5 of the 6 bolts that hold the clutch cover in place and loosen the 6th bolt. With the loose bolt positioned at 12:00, I could swing the clutch cover and friction disk to the side and make enough room to install the clutch fork.
What worries me is if I do that, will I have enough room to properly install the release bearing (throwout bearing)? Since it appears that the extra thickness of the heavy duty flywheel is eating up so much space, will the release bearing essentially be engaged all of the time?
I really have nothing to lose mocking this up, since I have to remove the clutch cover anyways. I'll just take a few minutes and see how everything lines up. If it does not appear to be workable, I'll remove the clutch assembly and heavy duty flywheel and move to the flywheel that is in the engine that came with the truck. I might try activating the old 6V starter that's on that engine and see if it works. If it does, then I'll likely just stick with that starter since it already pairs with that flywheel. All I would need to have done is to have the flywheel resurfaced and buy the correct clutch assembly. If I end up going with that flywheel, I'll post in the parts for sale section to sell the heavy duty flywheel. Surely someone could use it....
