In the process of changing manifolds and risers after 15 years (and signs of moisture in one engines oil and also in the exhaust passage). My boat is a Monterey 282 which has virtually no access to back side of engines. Now that risers and manifolds are off, I can finally access back side of engines! Planned on changing distributor caps and rotors - just because I am there. I have no running issues. Is this a smart thing to do? Should I be changing something else? Should I change spark plug wires? Appreciate any advice on what I should tackle whilst I have access to the backside of engines. Thanks