360 timing issues

60Powerwagon said

It’s hard to believe that every one of those was working fine and now one isn’t. I’ll see what I can figure out. I have a truck I can swap some parts from to try. I’ll have to look again, but I believe it has the silver ignition box.

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Well, lets face facts. It was fine and now it isn't. Something changed. If not fuel delivery, and you are sure the timing is correct, and all electrical components are working fine, then you messed up the heads or the installation of the heads, valve train assembly, or the pistons or the installation of the pistons. Swapping parts from a known good vehicle is a great idea. Process of elimination.