Thanks crenwelge. I've seen that '81 Astro. That would be the truck for me but I'm sure the price is way more than I can afford. I've seen a couple of cabovers with Detroits here http://bradsclassictrucks.com/ but they are not GM. One is a '78 Peterbilt with a 8v92 and the other is a '70 Freightliner with a 6-71. I would prefer the 8v92 or an 8v71 if I were buying right now.