Hmmm,,,,If this Mustang is your prized posession and on top of that a 390 BB and you've been working on it for over a decade, what does it matter what it's going cost to have it hauled by a well known transport company? I know your distance is approximately 1100 miles. THAT'S a long way. Skyway65 said that Reliable is EXCELLENT, and drivers that "get it" when it comes to classic and vintage cars. I'd say that these professional know how to "start-up" any classic muscle car with a little instruction from the owner. And on top of all this, I'd say MOST, if not all, well known haulers have excellent insurance.
So you ask yourself, do I want to take the risk of pulling my "prized possession" 1100 miles, with a vehicle I've never drove before and towing a trailer I've never towed before and risk something happening and just HOPE your insurance covers any/all the damages?
To me, it's a no-brainer". I would spend extra and let the Professional do the hauling of my "prized possession", JMO.