That is one beautiful boat. Most likely you will have to do a complete tear down and replace the blocks and possibly the heads and exhaust. If it were me I'd build up a nice set of Dart 427 short blocks and go from there. Easy to make a good 500+hp that will live forever.

Very pretty Cig.....sucks that the engines are ruined but the plus is you can pick your power and start fresh with trouble free engines.