It appeared my 25 year old valve spring compress tool had to be slightly modified to be able to work on the Pan heads too, no big deal.
To be able to get the manifoild nipples removed without disturbing the head threads (their threads where badly disturbed in the area where the securing rivet had been replaced by a soft screw. This allowing those parts to work back and forth, no good and a fair amount of gasket compound did not solve the "real" problem) they had to be split twice by a junior hack saw blade, a paintaking process of umpteen minimal cuts. When split the intake nipples where given enough pain by a chisel to slip out of their holes, sucess, no thread damage.
Upon inspection of valves, guides, springs etc. the conclusion was quite easy, change it all!
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