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Tom, I can understand why you would not be concerned about these valve springs. If something happens along the lines of a spring breaking and it causes damage to the piston and valve, requiring that the head be pulled to work on...and maybe a piston replaced... you will not be on the line for the cost...
I am saying that given the knowledge that the engine sat for years... which means some of those springs were in a constant load situation compared to the other ones.. that they may float at a lower rpm than the others....and / or break ... so the question to you is whether or not this design engine, if a valve breaks, has the potential for causing major damage... piston to valve contact.... and the relative cost of simply putting new springs , valve rotators , valve stem seals, and new cap and lock nuts on the valves... like the FSM suggests doing periodically.... compared to the potential for larger damage leaving it and using it after a long rest.
Those things I just mentioned are easy to do when doing a valve stem seal replacement... they are all OFF sitting around anyway... so the only difference in putting it back together is having the news ones to install instead of putting the old ones back in....
Some research into metal fatigue in general would be advisable before making the decision.
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