I have a W116 280S with the venerable M110 engine. The engine is fine, but I have an M117 V8 that I'm going to put into it.

I also have a W123 300td with a really tired engine. I've always wanted it to be a gasser (let's not go off-topic debating diesel vs gasser), so I figured I'd swap in the M110 from my other car, since that engine is perfectly fine and the W123s came with that engine anyway.

So before I jump headfirst into this, what do I need to know?

In particular, what parts from the W116 will not work on the W123? Finding a W123 280E at the junkyard is becoming rare, but there is one right now, so I could go grab the parts that I need. Are the engine mounts different? Radiator hoses? Transmissions?

What else would I need from the W123 gasser to convert my diesel? Throttle cable/linkage? Driveshaft different?

I'm prepared to do any and all fab necessary, but I figure this should be 99% bolt-in. TIA!

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'82 300TD
'77 6.9
'75 280S
'74 280
'87 Porsche 944 turbo