Is 350$ fair to replace and install a new oil valve gasket on 2000 toyotasolara? on 2000 Toyota Solara

the mechanic is my girlfriends father's high school buddy, just making sure it is a good price. he is usually fair, but ive been reading up and heard that 350 is a little high... just wondering if i should look for a new mechanic... thank you!

Asked by for the 2000 Toyota Solara