Easy, I think, the clutch linkages will be the toughest: mechanical to hydraulic. Get yourself a 5 speed and bellhousing out of a later model two wheel drive, 318 or 360 truck, have your jackshaft made longer or shorter along with any front u-joint changes. You might even be able to reuse the stock crossmember. Maybe think of grabbing all the hydraulic clutch stuff out of the late model donor.
Very do-able, good luck and keep us posted
Very do-able, good luck and keep us posted