641Workmaster,
Several thoughts come to my poor old mind. You obviously know about being 180 degrees out of time. Unless you have confirmed that #1 is on TDC when you do your BB thing, you might be going in circles.
The valve train can get pretty funky after sitting that long. If you can pull the valve cover and see that all is well, and all is working, you could scratch that off your list.
A compression test would really help you evaluate what you have to work with. If half the valves are stuck open, getting the truck started could be tough.
Have you put a plug wire to a ground as you cranked the engine...you should get some spark.
Your 'economy' carburetor rebuild would worry me a tad.
Do some of the things listed above and give it another try. Good luck.
Stuart
