Did you check the end gaps of the new rings? You could have an oversize set BOXED WRONG in a STD. box!
You shouldn't need another gasket set - just replace the gaskets you need, when you tear it back down - if you do! I only use sealer on THE BLOCK SIDE to hold the gasket in position, light grease on the opposite side. Seals well and makes life easier if there is an 'oh chit', as in your situatation! Head gasket should be OK to reuse, since you haven't fired the engine.
Back off the rockers all the way, see how it turns over. Valve springs might be in coil bind. I adjust BOTH rockers at TDC of the compression stroke of each cylinder, or in that area - doesn't have to be precise. You'll see both lifters about even in the block too.
It's HARD not to think of 'worst case', but stay positive, work a step at a time, and you'll catch the issue, then correct it. Hopefully, you won't have a lot of extra work ahead!
Good Luck, Tim
