Thanks for the advice - the 351C it will be. I figured that was the best route, but thought it was worth asking.
What happened? Exhaust spring broke which eventually led to the valve bottoming and .... thus damaging the head and ultimately led to the block being damaged as well.
Just time I guess as I was only idling away from a traffic light under very low RPMs and then lost power and heard metal to metal - not a good sound.
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