Hi Bob;

Meant to mention a few more HP options - mild street port and extended street port are also good options if the engine is already apart.
Here are a few web sites with pics of various port types - don't believe everything that is written - particularly idle RPMs.
http://www.turborx7.com/portingpictures.htm
http://www.mazdarotary.net/porting.htm

Cheers
Cary