The condition you describe can be caused by several things: 1) Valve timing off. 2) Valves adjusted too tight. 3) Valves not seating properly. Possibly wrong grind on seat or valve face. 4) Rings too small - end gaps too big. 5) Camshaft worn out, valves not opening as they should.
Having had it running (or trying to) on just one cylinder does NOT rule out valve timing. Somewhere there is a major problem that is being overlooked. Go back to the basics, and recheck all of your work. Keep in mind that timing gears and chains can wear enough to cause your engine to jump valve timing. The usual result is low compression. A worn out camshaft will not let the valves open sufficiently to pull in a good air charge when needed. I would think that normal compression on ANY engine needs to be in the 90 psi range for the cylinder to fire. Hopefully you have enough ideas for things to check over.
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