NV4500 swap.

Something to keep in mind, I believe the NV4500 was behind some 4.7 V-8 in later half tons. The bell pattern on the 4.7 and 5.7 is same as old small block. LA and Magnum. Use the 318 truck flywheel with the 4.7 clutch assembly.
Only thing I've seen in 1/2 tons is the 3500