I found a deal on a set of new Screamin' Eagle Performance Heads that I just couldn't pass up. I plan on putting them on an '05 fuel injected 88ci Road King. It is currently stock except for the Stage 1 flash and SE exhaust. According to the SE Catalog, the heads should raise my compression to 9.5:1. Which Andrews gear drive would be best with this setup, the 26G or 37G?