Kristian,
I'm not a tall guy, but I still wanted a Cobra with good legroom. When I was looking at the different kits, I went to several of the manufacturer's factorys and to the Carlisle Kit Car show so I could sit in them to gauge the footroom. There is a BIG difference in footroom between the manufacturers, and you really can tell the difference in the extended wheelbase cars.
The manufacturers I know of that offer extended wheelbase kits are
Hunter Kit Cars,
Lone Star Classics,
West Coast Cobra , and
Classic Roadsters (you might want to read this thread before you consider them -
Classic Roadsters customer complaint to the Attorney General of North Dakoda )
I believe that all of the above manufacturers offer carpet and leather seats. Lone Star offers Air Conditioning (West Coast may also - not sure). Hunter can set up the car for air conditioning. I'm putting A/C in my Hunter, but I'm the first guy to it - Hunter made some modifications to my kit in order to accomodate the A/C.
Lone Star makes a very nice kit with lots of legroom and probably the biggest trunk in the business. I visited the Lone Star plant and was quite impressed. Downsides (for me) were price and the solid axle rear end.
West Coast also makes a great car, the biggest plus being the space frame (one of the few in the industry) and lots of room in the passenger compartment. The downsides (for me) was I personally didn't like the look of the body, and solid rear axle. The body shape is just to far from the original for my tastes.
After weighing the pros and cons of all the kits, I choose Hunter over the other manufacturers above mainly because Hunter is the only one that offers Independent Rear Suspension (it has Corvette suspension). Hunter was also significantly cheaper than Lone Star and West Coast.
I won't touch the small block vs big block, as that has been debated endlessly on this forum. I'll just say I went with a big small block (408W stroker).
Pete