Is this a "nused" boat? Is this the first time you are doing any service to it since taking ownership? If yes, then you really should do ALL the standard maintenance so you have a base line to work from. That means in addition to the cap, rotor, points, condensor, wires, and plugs you also replace all the rubber bits. That's cooling hoses, exhaust hoses, fuel lines from the tank (are they pre-ethanol?), impellers, and breather hoses. Use new AWAB hose clamps, doubling those below the water line. New circulation pumps would be a good idea too. While you're at it redo the packing in the stuffing boxes; both prop shafts and rudders. Check all your electrical connections and batteries for loose or corroded fittings. Touch up rusty areas with paint. Once you have all that done you should make note of it and then keep up with regular intervals.