Why? Just get a Rabbit. They are 99% Omni only infinitely better and readily available as diesels already.
well the bolt holes in omni block same as vw.. so they direct fit... with proper vw engine block style mounts... later omni had dodge engines... so when i refer right mounts... the tricky piece... the pressure plate/release plate on a omni is different then vw... screws up the cable length... but i cannot rember why this is.. maybe different push rod or something.. but ive run into this in the past long long long ago...
"Most" of the VW diesel and 020 trans was a direct bolt-in. I am using an 020 4-speed in my diesel Rampage, which would have been the stock trans on a pre-2.2L manual trans Omni/Horizon/O24/TC3/Charger/Tursimo.The mount on the front of the engine has to be custom fabbed (front as in pulley end). The 1.7L gasser mount will not work in this location due to the needs of the injection pump mounts. The other mounts will work, but they must come from a 1.7L Omni. 2.2's are different.The shifter linkage from a 4-speed 1.7L Omni will work, but you must have an "Omni" 020 4-speed tranny linkage. They are different than those found on true VW applications.The clutch cable needs to be from a manual trans 1.7L Omni. You will need the pedal cluster from the same donor car.It can be done, but only worth it if you have a pretty good reason. A hopped up 1.9L AAZ Dodge 024 might be pretty cool, though.Steve.
If you were swapping into an early L-body that still had the original 1.7L / 4-speed drivetrain, it would be pretty straightforward to covert to VW diesel power. The front motor mount would have to be custom fabbed, but the rest should bolt in. That would get you the functioning engine and trans, but doesn't consider things like air conditioning, power steering, power brakes, etc.I'm running a manual rack and pinion, manual brakes, and no A/C, but mine's a race vehicle.