I mentioned that I would report back when received the manual, here goes:
I purchased the service manual for 78 Chevy Truck, the one mentioned in 78 Chevyrado's reply. Shipping was excellent, ordered on a Sunday and got it the next Friday - that with Monday being MLK Day and the post office was closed. I got it
from here.
The manual is good quality and printed on heavy stock. It is punched and bound together with a metal strap, the metal strap is then covered with what looks like a type of duct tape. He mentions in the advertisement that the manual can be cut apart and placed in a 3-ring binder - I may do that.
As a pleasant surprise, it also came with wiring diagrams. They are printed on 11x17 inch paper.
It was a bit pricey, about $62 + shipping, but I think it will be worth every penny. It will have paid for itself by the time I finish the brake job on the K30.
Since pics are worth a thousand words: