As an alternative to building the 4.0 and then turbo, which if you have the 190hp 4.0 at 10 psi would be ~ 320 hp
Consider doing an engine swap to the GM 4200 - they are either 275 or 290 HP stock. More than a few have turbo'ed this engine and are getting 425HP @ 8-10 psi on a stock block engine.
At the end of the day its probably equal work to do the 4.0 build and the swap and your 100 hp ahead.
Complete engines with all the parts inc. pcm/harness etc can be had for ~$1600.
extras on top of that are:
Jerry W. flywheel
adapter plate
oil pan ?? not sure where the stock sump is on the 4.0
and custom engine mounts
limeswap PCM fix/harness mod
google vortec4200
