I have a 1995 K8 1.8L V6 Mazda engine with OBDII wiring and ECU. Its done 149,000km and has some suspected issue with piston rings (i just used that as an excuse to upgrade).
Its capable of dishing out 99kW from factory and would fit in a Eunos 30X; MX6; TX5; etc.
Price is $300 negotiable
Engine is located in Northern suburbs in Melbourne.