If a tracks elevation is 320 ft. is that sufficient? Just curious because I'm comparing what I ran before to now with different elevations.

 

Sufficient compared to what? Technically, that can still be considered sea level elevation.

Track elevation doesn't mean much. Taking into account the elevation, temperature, barometric pressuse and humidity you get a density altitude. You can easily have a lower density altitude at a higher elevation track in good weather than you can have at a lower elevation track in poor weather. A hot sunny day isn't considered good weather.

 

Sufficient compared to about 1200 feet. It was about 1200 feet at the track I went to last time at about 90* and high humidity. This Friday, it's supposed to be a night race, will only be about 65-75* with low humidity at 320 ft. elevation.

 

If nothing changed except the altitude, you'd run about 0.15-seconds quicker at the lower altitude. But as Stephen points out, you need to consider the affects of temperature, absolute humidity and barometer as well.