That sounds like a reasonable price. I work in an automotive machine shop and the best advice I can give you is don't base your decision on the shop you use on price alone. Talk to some people, mechanics, racers, and restorers, see what they have to say. Quality machine work isn't cheap and skimping will cost in the long run. Also expect to spend the most money in the cylnder head. Just my 2 cents.
Sean
Sean