Nothing wrong with pulling it apart before start up, quite opposite IMO.
Having a good look with the heads off and the ability to easily clean out all the crud that may be in there is a safe route.
Plus parts aren't that expensive and the return is always welcome.
Seeing though its been sitting for a while you will also get a good idea on all the rubber bits and peices that are now kaput.
Have you got a time line and budget, or are you just going to wing it?
Keep the updates and pics coming, remember to not lose to many nuts and bolts.
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