I tried wiring the stupid thing up on my Quarter Stick and the only position I can make it turn the car over is in a position between reverse and neutral. I noticed that there are two pairs of spade terminals and I used the top two. What are the bottom two for? The instructions Mr. Gasket gives are pretty vauge.

Two are probably for reverse light (which sound like the ones you are into now but the switch is not adjusted) and the other two are the neutral/park safety switch.
The reverse light switch terminals will only be closed when the shifter is in reverse and at any other time they will be open. The neutral/park safety switch will only be closed in the park and neutral position and at any other time they will be open.
The switches may be mounted to a slotted bracket to allow adjustement or there may be some other adjustment like a linkage arm or cam.
The only thing that concerns me with some of the small micro switches that are supplied with aftermarket shifters is the amount of amperage they can handle. To me they look too small to handle what they are rated for, but then again they are not passing current for hours at a time.
Jim

Y'know what.....you might be right. When I get it to crank, it cranks kinda slow like it's not getting enough current. I'll try swapping terminals and see what happens.

Take a look at this: http://www.chevelles.com/forums/showthread.php?t=55580&highlight=switch

Ah thanks........I always search for stuff first, but looks like that eluded me. But everything's all gravy now. I can finally go racing:D!

I'm concerned too about the rating of the switches. On my B&M, the neutral safety switch failed after 10 years. Ten years is a long time, but for a rarely driven car this is not OEM level of reliability.

So, I soldered a 100mu-F (micro Farad) capacitor from Radio Shack across the switch terminals, The idea is that the little arc that occurs across the switch contacts every time the open/close is the biggest ingredient to wearing out the switch. The capacitor "absorbs" the arc and extends the life of the switch terminals.