I'd suggest doing a good sealing job on intake and exhaust, fog the cylinders with some type of preservative oil, and do little, if any running until the truck is road-ready. Loosen the valve adjustments to close off all the cylinders, regardless of camshaft position. Piston rings don't seat properly until they get run under load for several cycles. Perfect Circle used to recommend 10 full throttle pulls from 30 MPH to 50 MPH, preferably uphill. Other than creating a smoke screen that's rough on the local mosquito population on the first startup, putting an engine in sealed long term storage doesn't cause any problems.
www.ebay.com/itm/397595251700?A friend who owned a salvage yard would store take-out engines upside down after draining most of the oil out of the crankcase, to allow residual oil to puddle in the combustion chambers and piston ring area, after blocking off the intake and exhaust manifolds. Those engines could be stored indefinitely, without locking up from rust.
Jerry
