The motor was purchased in 1993 and at that time was around the $3000 mark, the engine management computer was around $1100 (1993) and the LPG computer was around $500 in 2001.
We checked the motor way back and the mains and big ends were not even to the run-in range so we figured that the motor was close to new say about 20000kms - 40000kms.