Dropped a valve seat...what's the verdict? Options

[billh1963]

Way back in August 2013 I went to start my 914 and heard a funky noise. I immediately shut it down. Using my limited mechanical knowledge (and a tremendous amount of luck) I postulated that I had dropped a valve seat.

Three years later I decide it's time to get this 914 back on the road. Pulled the heads and, sure enough, a dropped valve seat. Prior to the issue the car was running good...no smoking, seemingly good oil pressure, etc.

I'm hoping I can get by with just rebuilding the head (if possible). Anyone see anything that would cause me to deviate from this plan of action?

[porschetub]

Oh dear the head is scrap ,not worth the repair cost,have seen worse,broken valve hits piston bends rod etc old story total carnage at high RPM,yes good move on the quick shutdown.
That piston will clean up,a WTB could yield a good core head to rebuild be I would be checking the other head,honestly not worth the gamble IMO.
Hope all goes well.

[billh1963]

Oh dear the head is scrap ,not worth the repair cost,have seen worse,broken valve hits piston bends rod etc old story total carnage at high RPM,yes good move on the quick shutdown.
That piston will clean up,a WTB could yield a good core head to rebuild be I would be checking the other head,honestly not worth the gamble IMO.
Hope all goes well.

Other head looks good.

This event occurred after driving on a hot day where the oil temperature got up to around 230+.

I started it up the next day and the valve dropped as soon as it started. I shut down the engine while it was idling and after it only ran a few seconds. I'm hoping the piston is okay.