Yes, 66 mounts are higher. Take care if you get headers. Some will not fit with the early mounts. It may take a call to the manufacturer to find this out, but you should check.
Based on the use you have described earlier, I would go with a 7" rim on front with 4" backspacing. You can use an 8" on the back with 4.5" BS. I swapped my 225/50-16s up front for 205s and never looked back. It drives better with the narrower tire and I don't miss any traction on the twisties, even when driven spiritedly. I'm sure that there is a difference ... I'm just saying that it isn't much, and on the street you are unlikely to notice anything, at all. A 225/50-16 on the rear is a good size - looks good and gives decent traction. We don't drive these cars enough to NOT have the tires go hard before they are worn out (usually), so get a sticky tire (poor wear rating) like the Kuhmo ECSTA MX tires, or similar 200-220 rated tire (wear rating). Those Kuhmos really stick.
Another thing: if you keep the tire on the rear at the size recommended, you are unlikely to break anything in your drivetrain. The tires will break loose before anything else breaks. It's a nice safety precaution. Besides, it's easier to chirp in 1-2 shifts with your C4.
