I have used RELIABLE CARRIERS in the past, as does the auto industry folks in Detroit for show cars, concept cars etc. see :
http://www.reliable-carriers.com/
I also used Rich Lacey, advertiser on Club Cobra. He delivered my 57 Bird I bought outside of Denver to my home in Detroit area in prompt fashion with car arriving looking just like it did when it was loaded for shipment. Great service.
there are many listed in Hemmings,most already mentioned here on other posts. Go with one that someone has had good expericnces with though , let someone else be the guinea pig for those without referrals. bill