well, you have to remember that the early 914s were quite roomy. No console allowed you to have someone sit a-straddle the gear shift, so-to-speak, and laps were easy as the foot well wasn't coffin like. I had plenty of room at 6'2.
Now my wife's current Miata, that is a shoe-box of a different neck cramp.
The same could be said of the 911. I have a buddy with a 911, and at 6'6, 290, it's rather coffin-like riding with him.