For the $, I would drop in a B20B or B20Z CRV longblock. You can reuse your tranny, ECU, distributor and engine harness. That would be a cost effective swap that would add some more low-end grunt and not to mention a newer, fresh motor. If you could track down a 92-93 YS1 GSR cable tranny, you would have an even more potent setup with room for a lot more potential.