I tend to want to re power most w114's unless they are rare as in highly optioned. If I had to rebuilt the M110 I would look for something modern.
You can pick up an M104 engine car with a 4 speed auto like a 1993 300E for a thousand and swap that in. More power/torque and much better fuel economy.
I can write you out a step by step with all needed parts. swap is not that difficult if you have some basic mechanical skills and can use a Digital Volt Ohm meter.
Thanks so much for your reply.
I like this idea a lot. I had a 1987 300E. I am not a power freak, but I thought it had oodles of power. My only reservation is that it may be too much power.
Before posting here, I had checked on availability of a 1990 300E engine. I can get one with 89K miles with a 3-year parts and labor warranty for a reasonable price. I don't know if they will do that if I don't put the engine in a 300E.
FWIW, I didn't have very many problems w/ the 300E except when I had it serviced at the dealer for things like AC. For example, they left the main fuse off and couldn't find the problem. I also got very reasonable gas mileage, over 22 mpg on the road if I remember correctly.
Anyway, I would love to have a 300E engine in the car if it can be done for at a reasonable cost.
A step-by-step would be really nice; I would really appreciate seeing that. That way I could see if I need a donor car or just an engine, what is done with the FI, and also what I need to make it fit in.
You mentioned skill level. I am not a pro, but I am patient. As an example, take a look at the following link:
La Reprise - eccononno
Again, thanks for your response; it is really encouraging.