How far are the pistons out of the hole ?

How far is the bit of piston that made contact out of the hole when it's rocking at it's highest ?

And how thick was the gasket ?

That will basically give a clue as to whether you need to delve into bearings or not

The pistons may have just been hitting as they rocked at the top of the bore, which you will hope for.

But potentially there is bearing damage, piston damage, pistons squashed and rings trapped etc.
You'll probably be lucky though