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I'd be first removing the head and checking everything else. Cracked pistons etc etc. Last thing you'd want is to put on a new head then later on it drops the pin in a cylinder or two.
FYI, when my pump failed on the ZD I was going to just put a new pump on. Then I go the green light for the conversion. My old motor was stripped down at the workshop and they found number 4 piston was cracked. Even though the inside of the motor was spotless due to my strict oil change regime and the motor still when really good... So If I have spent the 4k, or what ever it was, on a new pump, it was only a matter of time for that motor. And it would have been 4k just shot down the dunny.
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