Octane Rating?

[Fostang]

I always run 92 octane gas in my car until today. I was storming around town not noticing my gasoline gauge until I had about a gallon left. I hate running it that low but I had been in such a hurry to do all the things that I needed to do that it happened. I pulled into the first gas station that I saw. Hoped out of my car running to the cash register because I was already 5 minutes late to my moms dinner party. Came back and without noticing and I could have sworn up and down that I grabbed the 92 octane nozzle when in fact I grabbed the 87 octane which I didn't notice until I was done pumping. I was like oh shnap what have I done. No time for kicking my self in the *** so I hoped in my car expecting it run like crap until that gas tank went on empty. If you have read my older post of how I had problems after installing a set of heads that were ported and polished you can remember I mentioned that my car smelled rich no matter what I did and even when I thought I had fixed the problem it came back again. Well now with this gas it idles so much smoother doesn't smell rich and runs just about the same. I'm confused I thought higher octane was the key to making your street machine run better. Sorry for the long post it's just that I'm a little woried if it will come back and haunt me if I continue to use 87 octane.

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67'fastback-Edelbrock carb,intake,cam,valve springs.Rhode lifters, CompCam rocker arms, windage tray,cerama coated headers,dual flows with H-pipe, modded c-4,tci stall converter,perma cool electric fan,aluminum water pump,griffen aluminum radiator,accel 8.8 cable,wide cap distriburator,magnetic pick up,v-matic hurst shifter,edelbrock performer nitrous, carter electric fuel pump,ignitor coil,solid motor mounts,magna racing suspension,poly urathane bushings,under rider traction bars, comp. eng. s