Can't help you with dimensions however I do suggest you bring your enclosed trailer with you to view the car and drive it up inside it. I don't see why the seller would care since your going to test drive the car anyway.
Besides, people can't give you dimensions for a car they know nothing about such as what year it is and is it a GT, LX or coupe? These vehicles will have different lengths.
P.S. Check torque boxes, body lines, floor pan for quality since too many of these cars have been rode hard and put away wet. Most people don't really know the history of their vehicle because their the 5th, 6th, 7th, etc.. owner and people lie or were told lies from previous owners and are unknowingly passing lies to the next sucker.
Good luck and let us know what you got, pics are nice too.