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In no particular order as I've noticed them on the photo:

Fuel pump, A/C compressor, both manifolds, turbo.

If you're not going back to having the Ti EGR system, there are a lot fewer parts to worry about.

After that, engine mounts (if you don't have TD mounts on the chassis already), flywheel/flexplate (manual vs. auto), lots of bolts for gearbox, etc. Clutch.

PCV hose to your intake manifold (via a catch can if you want).

Timing cover plate for fuel pump.

Coolant hoses for heater. Also, depending on the turbo you choose, you'll need to alter the turbo water supply arrangements to suit. Get rid of that Frankenstein hose thing on the front.

Oil feed and return line for turbo (will probably be supplied with your turbo if you get a TD specific kit).

Gaskets and/or gasket goo as needed.

Can't see well with the photos - starter motor may be needed as well (try and get a genuine one if you can, they just work better).

At least your rear main and welch plugs appear to have been done recently, but while the motor is out, I'd be getting to every part that is a pain to get to while it's in the engine bay. I would probably suggest taking the sump off and re-sealing it - some people try to do the rear main without re-establishing the sump seal, which tends to lead to oil leaks. Sometimes you get lucky, generally you don't.

Close up the intake/exhaust holes and give it a good clean, so you can find that bastard of an oil or coolant leak when it happens.
 

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EGR needs EGR manifolds, the intake butterfly (and control stuff that goes with it), EGR cooler, water pipes, etc.

If it's not going on there and you don't have manifolds, it's not an issue.

Just note that for engineering (if you're doing it), if you call it a Ti engine, it will need to have an EGR system fitted, as they came out with it from factory and you can't go backwards with emissions for the engine.
 

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Depends on how much the engineer knows about the motors and the years when they were released - they'll probably be able to track down that it's a Ti if they really want to. Also depends on if you want to start your relationship with your engineer by not giving them all the information they need to make a 100% above board conversion.

The only truly annoying thing will be that to have the EGR system, you'll need to get the factory inlet and exhaust manifolds, along with the heat exchanger, the other supporting components, a factory Ti (or compatible) pump and a Ti ECU to run the EGR.

This is one of these questions where you start the relationship with the engineer now and ask them all of the questions while it's still hypothetical vs. building something and then being told you need to undo it.
 
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