The rod journal is only 2" on a 4.7 so you're looking at Honda journal size for off the shelf rods. Going from a 2" to an offset 1.88 journal only gains you .006" stroke does it not? With a .030 overbore that is 5 cubes. Not worth the bother IMHO.

Has anyone flowed a 4.7 head? That number would give you some idea of the engine's potential.

2 ways to get serious power out of a small package, spin the wee out of it or boost (or both...). OHC make the former a little easier but a 5000lb truck needs torque so my vote would be for boost.

Kevin