Having been there and done that I say skip the tons and 47's. You will gain a lot of weight and not much more ground clearence.
1 22re and a stroker kit with turbo injectors and a good head, mild porting. My brother in law has one runs awesome great power.
2 22re turbo pistons and injectors, msd ignition with boost retard, head studs mls gasket 8-10 psi. you'll love it. My sweet spot is 4th gear double low with 4.88 gears and 42's. lots of power, I made some 500 plus horse power rigs look bad at the mud bogs the last 2 years.
3 3rz great power and torque, But at 10psi I have more power and torque. At 16psi LOL an easy 250hp.
The 4.3 weighs more and at 190hp for the vortec is an ok option but I say keep it all toyota. 1uz a wiring nightmare, don't know what it weighs, but more than my combo. I just pulled off my 12,500 winch,bumper,inner cooler and nerf bars. Shaved 300lbs off the truck ,what a difference! Keep it light for the snow and mud. Just my 2cents.
