Or, buy a 1.6. I bought a 95 tracker for $800. Pulled the motor and harness for mine, sold axles and a few small parts for $250, scrapped the rest for $300.
You could be a lot cheaper if you did harness yourself and built mounts, etc, but it cost me less than $1000 to do the 1.6 16V swap with off the shelf parts and someone else modifying the harness.