New Engine for Ranger 33

[edwehrle]

Due to several problems, we find that we will probably need a new engine for our 1974 Ranger 33. We're talking ring job and new head. Right now it has an Atomic 4 gas engine. We are trying to decide on whether we should look for another Atomic 4, or go for a diesel, rebuilt or new. Have even heard of an electric engine for sailboats now. Any suggestions or advise would be very helpful. Although we have sailed before this boat is relatively new to us, especially the engine.
Thanks in advance,
Eva