Allow myself to introduce.....myself.

[GySgtFrank]

Welcome, very pretty car. Tear the old engine down first and find out what went wrong. There are quite a few people selling parts all the time either here, other forums, or ebay. It'll save you a lot of headaches if you can fix yours. Used engines are always chancy, especially with rotaries, if they weren't stored correctly. They are not hard to rebuild, with quite a few shops around the country specializing in parts as well as complete rebuilds for them. The downside is that if you take it to a local garage they'll look at you like you're crazy. Be careful of who you have do a rebuild (doing it yourself is always good). Others, here and elsewhere, have a lot of horror stories of shoddy and ill informed rebuilders.