In this eBay auction of a very, very nice 450 SLC:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4545657055&category=6338
Note the speakers placed on the floor in the corners (very professional, carpeted). I thought that this was an interesting idea, and this stereo installation looked pretty "blank check".
On the car itself: I'd actually beleive these miles. You could make breakfast on the valve covers. It's that clean. I'd buy it as the "winter" car if I had the dough. Obviously, the owner spared no expense on this car.