Well, using some very fuzzy math, of the 400,000, I will guess half were c10's, an addtl. 150,000 were 20's, and the remaining 50,000 were 30's.
Of the 50,000 c30's, I would wager that only 10,000 had 327's, and of that 10,000, most had a very tough life of hard work and salted roads, so probably only 100 are in still operating condition. of those, 85 have had the dashboards cut like swiss cheese, 10 are complete customs, and 4 are barely operable rust buckets that let you look at the road while you drive(holding your feet up of course to prevent loosing a foot in a pothole)
That makes mine the last one in the world. I will cling to my dilusion ignoring any fact brought to my attention. thats my story and I am sticking to it!
Its really too bad GM didn't keep better track, it would have been interesting to know. I guess in the grand scheme of things it really doesn't matter too much, I still really dig the truck.