Prior to turbo'ing.. maybe just cover off on all the basics first to make sure you're not chasing gains that should already be there:
Valve timing bang on
Injector Spill timing perfect
Fresh fuel filter
Fresh air filter
Good high tyre pressures
Good injector spray pattern
Crack pressures on...
At the end of a day, its still an indirect injected head with precombustion cups - the block itself (like the late 2H blocks) may have features for a turbo that just require drilling and tap (oil feed, oil return, piston skirt squirters) but the head design itself is rather unsuitable for a...
Thats a relief! Any chance of a shot of your engine bay?
Dont rush to turbo it.. the 3B, like all NA Indirect Injected Engine diesel engines, is a bit of a slug, but they are so damn reliable and trustworthy and the turbo is often a bit of a slippery slope to failure and cooling issues.. drive...