TNRabbit

I don't know if anyone has ever used this engine, but it's an attractive alternate to the 3vze and weighs less. I've been considering it as an option....looks like you can get 300 hp out of it pretty easily..

http://www.rebuiltcrateengines.com/b...ne-p-2095.html

Dirt Driver

That engine was also adopted by Rover and used for a very long time.

http://www.britishv8.org/Articles/Ro...ar-Article.htm

The one bad thing I see is that many of them don't have specs much better than a 3VZE, however they do appear to respond well to modifications.