I have a 2.5 Non Vanos from a 1992 E36 for Sale. ODO states about 253,000 kms. The motor pulls strong, no noises, no codes, no clunks. Previous owner replaced the plastic T-Stat cover with a metal one, so cooling system was worked on at some point. I have no records, unfortunately, but the engine and trans are still in the car if someone would like to see if running before a purchase.
I am not going to split the two. If you want the motor take the combo and resell the trans. Could get someone a very cheap, well running, M50 NV for a turbo winter build.
Only thing not included with the motor is the engine harness. Manifold, accessories, etc will come with.