P61 also has an onboard knock board, and it's regarded as actually being very good. Good enough that we felt comfortable enough to test it on 87 octane to see if it would pull timing and all that jazz to prevent from blowing the engine, and it did. (93 Integra GS-R) No matter how much we beat on it.
Good luck finding one in the US, though. Only came on 92-93 GS-Rs w/ B17a engine. Much like the alltracs, only 3000 ever came over here.
There are also knock board add-ons for most honda OBD0-OBD1 ecus. I also think that some of them were randomly put on from factory, as i've tuned a few P32s that had them, and the owners definitely had not put them on, and were entirely confused when they saw that extra board in there.
You can get conversion harnesses to go from OBD2-OBD1, and i believe OBD0-OBD1 anyways. You can purchase pretty much anything you need from moates.net. They also have the equipment for datalogging and real-time tuning, e-prom burners and all that good stuff.
I know this is old, but Bozo-merlin, you should be able to use pretty much any mid 90s honda ECU, even if it's coming out of a Civic DX with no knock or vtec.
88Allheeze, when this is finished, if it's not already, i would be extremely interested to see a write-up, if you don't mind.