So I've been sitting back and fantasying about a project that I will call Craptane. How much reliable power can be made on 91 octane gas? This would be a money is no object project and include never before tried ideas like variable valve timing on a 5.8. Just wondering if it is possible to retrofit Ford's VVT on a 5.8 somehow. I certainly won't be trying this, but it is fun to think about.