I am from Portugal and I have a W108 MB. I’ve been thinking on that for several times! I also asked some help and opinion to “Mercamad6.3”. I already have the OM606 24V turbo diesel engine as some turbos and fuel pumps and waiting for the 6 speed gearbox to arrive. I didn’t make it yet for several reasons. First of all was lack of time. But I never drove a W108 car (it needs some restoration). I also have a W124 300D. And here are my big doubts. The W124 is a great car and I love it, but I really like the looks of the old W108 and W109 cars.
It’s a lot easier to get the modification on the W124 as it is just bolt on. I really don’t know how a nice W108 handles on the road and having in mind a “superturbo” W108 lets me preoccupied. W124 models can handle power very well and be comfortable also. We also have some more freedom here to have speed on the road – as there’s not so many radars or police control, so I go 110 mile/hour on highway trips very often.
I really had in mind making this on the W108 car and letting it as near as stock your eyes can see. Interior stock having the outside with a different set of wheels (Old Rial that I have or old AMG ones) and larger tires. So what you really would see is a “regular” W108.
My only long term experience with old Mercedes Benz was with a W115 240D 3.0 (300D in U.S.A.). It is also a great car and I sold it to a very nice friend of mine, but I don’t how it compares to a W108.
Owners of W108 cars please let me know, how a W108/109 car feels in terms of comfort and handling against modern cars and also W114/115 models. What would you choose, W108 or W124, for this project? I pretend to keep one of the cars for many years.