I've got the last AC Cobra MkIV produced before they went into administration which was fitted with a 302CI engine which I have had bored and stroked, fitted with Air flow research heads and an 8 port fuel injection system. This is a fairly common conversion for MKIV's as the standard 302 was well strangled with emissions kit and it results in the same (or more) power than a 427 but without the fuel consumption and engine weight. I have some friends with 427CI versions of the MkIV who report pretty horrendous fuel consumption (typically single figures) and they are are nose heavy, so the small block cars are reckoned to handle better.
Ride quality of my Cobra is better than my Aero 8 Coupe, but the weather equipment is worse than useless with a 50mph top speed recommended with the hood up. It is possible though that the kit car manufacturers will have been able to do better.
I am 5ft 7 (on a good day) and the bottom of the steering wheel is close to the top of my legs - but again the kit car manufacturers may have done better on the ergonomics - but the cabs are not big.
If you are serious about touring, I would think hard about a 427 as you will probably struggle to get much more than a 100 miles from a tank
