Im no FE guy, but take a look at this compressor on ebay. It has a hook that might grab the rocker shaft. Again im not sure , hopefully the FE experts will chime in.
eBay Motors: K-D TOOLS #2400 VALVE SPRING COMPRESSOR IN NICE SHAPE (item 110152479784 end time Aug-04-07 08:00:00 PDT)

Good luck

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Life long project. No it wont ever end....