Not sure on the layout of your engine bay. But one of the first things I do is remove the stupid bracket on the rear of the engine that is used to lift the engine out. It'* not really needed. 2 13mm nuts hold this in place. Disconnect the bracket holding the fuel lines on it and remove the whole bracket. Then throw it really far away. Once that is gone, you can reach your plugs much easier.
As for the coils. If they are that rusty, may be best to just replace with new coils and wires. That with new plugs and you will be all set.
SAVING THE WORLD ONE BONNEVILLE AT A TIME
1997,1998,2000,2005 year confused Bonneville SSExi. Stock? ish.
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