Distributor Dizziness..Help!

[4-Door Flunky]

Howdy. I bought a used head and put it on my 86 Integra. I stuck the distributor in place in the end of one cam, and I stuck in the sensor that goes in the end of the exhaust cam.
Now I find out that the head I installed is slightly different than the one I took off. There are only two holes to mount the distributor instead of three. Same thing with the sensor.
Here are my questions: what kind of sensor is it that mounts in the end of the exhaust cam, and:
Was there really a distributor that only had two mounting bolts?
If so, what vehicle did it come on?
I called the guy I got the head from, and he said it was an '88. I've just been to a junkyard and looked at an 88 Integra LS, and the sensor and distributor on it both have three mounting holes.
Am I freaking out? Yes. Have I lost it? Maybe.
Any information would be appreciated...especially if you have the dizzy and sensor I need.
Thanks.
Flunky