We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common !
Good that you have identified the "external ceramic ballast resistor"for your engine.I can`t suggest a coil make but it will need to be an "external ballast type"for points style ignition.The quickest test is to replace the distributor cap with a new one .More than one "offshore made dist cap" has failed with the first turn of the key !!
The plug wires should read no more than 500 ohms /foot,ie:2 foot wire =1000 ohms.My personal set-up is from Splitfire at 250 ohms /foot.
The 427 engine uses # WS 8100 a direct bolt on with no cutting .Many other makes are available ,but may require cutting and crimping connectors.Splitfire /1-800-477-5847 and press "0" to reach sales. Tim