A little late to the dance here but... it looks like you got your questions answered. Good advice on replacing 'yes' replacing your #4 rod. It's been stressed and probably bent.
Hopefully this may not be too late - There "is" an aftermarket manufacturer with a 'new' cast for the SPI SOHC head that supposedly addresses the dropped valveseat problem and makes it a non-issue. A thread somewhere here in this section during the last year was started on this topic.
Member of the Dropped Valve Seat Club.
Replaced #4 Piston, Rings, Rod+Bearings, AERA Re-Manufactured Cylinder Head and a light Hone. Then CLEANED the hell out of everything.