Little engine delimma I need help with.

not an A body but another project I have going. A few years ago I bought a truck pretty cheap with a blown up 4.7 in it so I pulled it out to replace and couldn't find one for sale so I rebuit it which got pretty costly because it was thoroughly destroyed. To make a long story short, between selling my business and my building and moving all my car stuff around it's ended up just sitting for about 5 years before we got it installed. When we fired it up we have one cylinder that is dead(number6) and I suspect the rings are stuck in that cylinder as a result of my procrastination and some sub par storage facilities so the question is, is there some mirical cure or desperation move I can try to get this cylinder to work before I start tearing into it again? Any practical advice or old car guy tricks would be appreciated.
Have You checked the compression in that cylinder? What led You to believe that is the issue? Did the rebuild include reboring, if so the rings should have a seal enough to run
on, the "stuck ring" syndrome resulting in a misfire typically happens on an engine w/tapered bores to the rings that sat at the bottom of a cyl. Have You checked for the
injector being stuck/contaminated or clogged, rondentia damaged harness, strong spark at the plug etc.? The screens in some injectors are so fine that water will actually
"plug" them, having set a while, an insect or debris could've entered the fuel rail & ended up in the screen, ........seen it all happen so,.....just some ideas...............