Just pull the plugs (damaged plug-damaged cylinder), usually only 1 or 2 cylinders are affected, sometimes it is all 4. I would just look into a used engine, figure new valves at the least 2 possibly 12 or all 16, pistons maybe 1 perhaps all 4 depending again on damage. Machining the head, Gaskets, valve stem seals, yadda yadda yadda. The machine work and parts gets expensive real fast. Then if a piston shattered the rod galled the cylinder. I've even seen cams snap. I get a lot of rio's in for engines, I pull the heads to show the customers, occasionally I put together engines with good used parts, bob weight the pistons, polish the cranks, valve job, new rings, full gasket kit, bearings, it gets cost prohibitive to really rebuild these engines.
P.S. you can remove the oil fill cap on the valve cover to see if the cams are spinning when in doubt.
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