A little late now, but you should not have forced the engine to rotate. There's something causing it to bind. Forcing it by push starting only encourages bent parts.
Remove the valve covers and back off the valve adjusters on each rocker arm, then try rotating the engine by hand (flex handle and socket). If it still binds, I'd suggest removing the engine, then methodically remove the clutch, then the heads until you discover the problem.
Let us know what you discover.
Sherwood
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