Another newbie, figuring out how to buy

[Dallas56]

I am another newbie, never owned a Cobra, saw one two weeks ago and must have. I am looking to spend maybe $40,000 to $60,000, am not a car guy, and have some very basic questions. It looks like my price range means I am looking at a low mileage used.
Among the body manufacturers Superformance, Backdraft, Factory Five, Unique Motorcars, do you recommend one over the others? Any others worth looking at? Any to stay away from?
What about engine size? I saw a listing with a Ford 514ci SVO. Is that too much? Any thoughts about 427 versus 351? Are there any engine types that are prone to problems and that I should avoid? Any particular engine types that you would recommend? Any specific thoughts about transmission?
If I am looking to buy something out of town, should I hire a mechanic where the car is to inspect and test drive it? Are there any particular issues that I should alert the mechanic to look for? What is the best way to get a car from another part of the country to where I am?
Are there any good ways to find low mileage Cobras other than this site, ebay, and craigslist?
Once I own this bad boy, I'll need a mechanic. Any recommendations for the Dallas area?
Any other thoughts/guidance? Again, I am brand new to all of this and don't want to make any big mistakes. Thank you in advance for any helpful response to these very basic questions.