Highest flowing sbm heads?

I run the RHS head from Brian on my street strip 340. Car runs 11.80s in humid summer and 11.60s nice winter FL air. My pistons average .020 above deck and a .060 gives me the quench to run 93 pump gas. I drive 50 miles to run at the track and the heads have been in use for several years. Brian at IMM is a great person to deal with.