300D 1977 without Turbo
I would like to install Turbo.
Pls. recommend brand name of original turbo and
which system need to be modified such as, oil, air etc.

I could be wrong, but I don't think your engine has oil cooled pistons like the turbocharged engines to compensate for the resultant heat and pressure produced by the added fuel and boost. For sure, you would need an injection pump that would "know" when to add more fuel when boost is present. Boost without fuel has no effect.

__________________
2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
-------------------------------------
'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

You would be much better off buying a junk turbo car and installing the complete motor. It is not worth the expense of adding all the parts onto an engine that will not last, it was not built for the increased stress. I have had the same issues with VW diesels/turbos, much easier to swap the engine then to add the turbo later. If you still want to do it, I have a good used turbo from a 1980 300SD, $150. You will need to change the manifolds, exhaust system, air filter assembly, all intake hoses, injectors, injection pump, oil pump?, oil lines to and from turbo, oil pan? for oil return, oil feed line fitting, vacuum system?, transmission?,
Greg

I think the crank is different on a turbo motor, if you want to continue, I also recommend finding a junker (that is hit in the rear) there should be a mountain of them in the States. I've been hit there twice.

__________________
When I close my eyes, and inhale, I can smell No. 2.

It's not easy.