I wouldnt turbo the 2.25 unless it was a 5 mains crank and it had just recently had the rings and bearings done...

the blowby control does provide the oportunity for it to run on on its lube oil but this can be fixed with a couple of simple mods. if you go this way I'll post you the details

I would also be considering changine the glow plugs as Ive heard rumours of the standard ones failing at the higher combustion pressures and temps.

oh change the raidator too or at least get the old one decked up properly.

Id like to do one, but not to my engie, well not the first one anyway...