I did the swap in an opposite application. 300D turbo engine into a 123, 240-D manual car (whose engine had blown)

Still have it out back. We enjoyed it for five years or so and it was very dependable. Still is, but my son has graduated to a TDI (or been demoted)

Fortunately, I had:

300 flywheel (from a euro manual)
Drive shaft from the same

The only mods I had to do were to shorten the linkage

I think you'll find plenty of advice on the forum as a number of guys have done it

If you have the right stuff on hand, a weekend is do-able. I've always figured about four hours to take an engine out and about the same to put the next one in. Then you can start dinking with the extras.

The guys recommended that I use a new pilot bearing.

I hope you enjoy the process as much as we did.

Diesel Don

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DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed