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Problem solved!
Hello everyone. I solved my on going problem!
I spent a lot of messing around with the 78' filler neck a few days ago and I called quits. Then that night at 2:00 am I got out of bed because I knew that this was going to be the solution. The two folded in lips on the inside of the filler neck that have the little stops on the end of them (so the gas cap can not rotate 360 degrees) was the problem. Over time I guess the inside folds get worn and pushed down from use. I spent about another half hour trying to figure out how to pry up the inside folds and what tool would work. This was difficult because you can not get a tool in from the backside, and you can't get a pry bar or screwdriver in the front because the front opening of the filler neck is to small. What actually worked perfect, and what I used was one of the hook tools from a swiss army knife. It has a 180 degree bent hook that is made out of thick material, like a fishing hook but much thinker and stronger. I inserted the tool underneath the folds and twisted and lifted the folds up. The locking gas cap fits perfect now, and doesn't come out by its self. It makes sense now why this was the problem. The locking tabs on the gas cap are tapered with a flat spot on the back. The flat spot needs the rest on the inside metal when sprung down in order to not be able to remove the cap. This was the problem.
Thank you for the support. Sorry for the long response. I just wanted to try and make my self clear if someone has this problem in the future. So both filler necks had the same problem. That was very unlikely, but It was the problem.
It also doesn't help that there are many different styles of gas caps for just this range of years. Just makes it more confusing. The filler neck is back on the truck and the gas cap is in, and it locks. Perfect.
-Gavin
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Keep on truckin' 
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