I live AT sealevel, and every track I've ever been to is sealevel (I haven't had the ability to experience things such as Denver (from a racing perspective).
Sea level will NOT cut that time off FOR you. EVEN at sea level, you'd have to trap at ~95mph to get that time with a 2.5x 60'.
EDIT: I see Y2K beat me to it. I should've read it more thoroughly.
Ray