Need some ideas for tomorrow with my ignition problem that I caused

[280zwitha383]

So my ZX has been running better than ever (bumped the timing up about 16 degrees from 2 degrees (haha), moved cam sprocket to the 2nd position putting the little indicator where it's supposed to be, replaced a bad injector and had 2 1/2" exhaust without the F'in cat installed). I've been getting 20-21mpg on the thing which is a good jump from getting between 15 and 17. Anyway, I still have a miss at idle so I thought I would pull the plugs and see how they looked becasue last time I did #2 was running rich so I figured there was something wrong with the injector and I replaced it. This time all the plugs looked good and were gapped right so I put everything back together and looked at a few other little things (vacuum lines, distributor cap and such) nothing that should have caused any problems (because the distributor cap only goes on one way). So I figure I'm done poking around and go to start the thing up. I'm cranking, no start and little bop bop out the exhaust. No biggie, I've swapped two spark plug wires (even though I'm 99% sure I did them one at a time). Except I didn't swap any of them. I went over it close to 10 times and I still don't have any idea what's wrong. After about an hour I gave up and went to the movies. It is a little strange to me that it's only backfiring out of the exhaust and not out of the intake. I've redone and undone everything I did and no change. I KNOW it's got to be something with the ignition/firing order but I can't get my mind around what it could be and unless I'm having temporary (or permanent the way this is going) insanity the spark plug wires are right. I didn't take them off of the cap and, on top of checking it an insane amount of times, I wrote the numbers on the wires close to the boot the previous time and put them back with those numbers (the previous time) and they're on the same cylinders now. This has got to be something simple I did on accident or forgot but I just can't imagine what it could be. Please help

[280zwitha383]

wow... yesterday I loosened one of the distributor mounting screws to put the ground wire that's usually on the top of the vacuum advance back on. I didn't realize it originally went on a screw on the vacuum advance until today. Anyway when I loosened that screw the rotor shaft must have gotten wedged a little bit and then caught 180 out the next time I tried to start it. I thought it was acting like it was 180 out but that wasn't really even a possibility in my mind. I set the thing to TDC and sure enough the rotor was pointing the wrong way. I spent a little over an hour on this sucker yesterday and 10 minutes today. I'm glad I figured it out though.