is 180k alot of mileage for an SHO

Depends on if you have a Gen 1 ('89-'91), Gen 2 ('92-'95), or Gen 3 ('96-'99). Is it an automatic or manual transmission?

The most important information to determine if this is a lot of miles is how was the maintenance? If it was properly maintained, then this is not a lot of miles. If the maintenance wasn't kept up on, then this could be a ton of miles!

-Rod