Put that same car on a dynojet. It will make about 20 whp less.

Concerning 13:1 on a pump gas engine. The only way I would consider running 13:1 would be on a setup using larger cams such as pro1s and using e85 pump gas.
Otherwise, stay at 12.0:1 maximum on 93 octane. Why? You will have de-tune the setup to prevent knock conditions it will become counter productive to such such high compression.