Drop the power to the "24V" as that was used for the vent damper not the spark system. For the BCS 460 connection why not use a 5-10 amp SSR and keep it relatively simple like you would for the pump and other AC loads.
Here is another ignition diagram, just change controller contacts for SSR http://picasaweb.google.com/kevin.ladue/Ignition#5420037998508461298. If the spark wire with the kit is to short a trip to the auto parts store for "wire core" ignition wire sold by the foot, a spark plug connector and boot for igniter end, female spade connector for spark module end, and you should be good to go. Call the auto parts store first as not all will have this type wire on hand, usually Napa autoparts stocks it.
Here is another ignition diagram, just change controller contacts for SSR http://picasaweb.google.com/kevin.ladue/Ignition#5420037998508461298. If the spark wire with the kit is to short a trip to the auto parts store for "wire core" ignition wire sold by the foot, a spark plug connector and boot for igniter end, female spade connector for spark module end, and you should be good to go. Call the auto parts store first as not all will have this type wire on hand, usually Napa autoparts stocks it.