66HertzClone: I like your build...but am curious about changing out the Demon. I certainly realize that efi will give better mileage and a bit better drivability, but at this point in your build, is there really the cost:benefit to make it worthwhile? Or [if I can ask without stepping on your toes] might there be a little bit of "can't leave well enough alone"?
As for the Gear Vendors, that is the PERFECT addition to your C4. They are superb additions to old cars and you will love it. That CLEARLY has the cost:benefit to satisfy me!!!
Also: really glad you left the vents in the back. It seems that everyone is putting in the windows, but the vents are so cool...and they are functional.
Congrats on the great job and nice car site.