I think things are getting a little confused in this interchange, so I'll throw in my 2 cents worth and leave you really confused. It's not the pretronics that can be 180 degrees off, it's the dist. itself. The first cylinder needs to be at tdc when the rotor lines up with the mark on the housing. But you can orient the housing any way you want, then slide the shaft in to the dist. mount, allowing for the fact that the rotor will turn maybe 20 degrees as it goes in. As long as the rotor and the line on the housing line up you're OK. If the housing were really 180 degrees off the car wouldn't run no matter what you did with the timing (ask me how I know). The cylinders would then be firing on the exhaust stroke rather than the compression stroke. So you probably have the dist in right and just need to adjust the timing so you see the ball rather than the z (which indicates tdc, I think) or time it by ear.
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