most of the people that will reply to you work in the business. i do, have for over 40 years. you can call 20 different places for the same service and get 20 different prices. do not go to the lowest or the highest. go to one that is busy and has a good reputation. check the BBB and local clerk of the court for law suits. ask about warranties. how long have they been in business? is the shop clean and well organized? do they have the proper equipment? take all into consideration.
also while they are at it have them look at the cam and crank seals. replace as needed
good luck