hard to say what's going on since we can't see all your timing marks, etc.
You can check for bent valves by buying one of those "spark plug air compressor fittings". Then you turn the engine until a particular cylinder is at TDC (both valves closed), then pressurize that cylinder. You'll know right away if you have a leak/bent valve because it won't hold pressure.
A compression tester might also tell you something.
If you rotate the engine by hand and feel a "catch", then you might have things lined up wrong.