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I've got the same situation. Only I used spray tack and now they are welded on so tight I can't get them off and they STILL leak . I've tried prying on them, to no avail. Guess I'll have to really get serious to get them back off to try sealing it again.
I've straightened the rail out, cleaned every surface to a perfect sheen, glued them and then they still leak a few days later. One note, make sure you use a lock tite on bolts. Seems mine like to wiggle loose and that caused them to leak on time before.
I've got 4 FE's and they all drip in some way out the valve covers. Some worse then others. They will always mark their territory!
I would get a 3 pound sledge hammer and a good sized block of wood and hit the valve cover HARD several times, it should give. Dont go wild on it just nice conrtolled hard hits till it breaks free. My valve covers were also leaking and I had to flatten the flange becasue it was so bent up. For know, the leak has stopped, I find the RTV on the valvecovers very annoying espeially since I take em off a lot, just an annoying mess.