kwkracing

I need a little help here

I am building a 9.5 to 1 383 that howell efi is setting up the efi to run on the street and hopefully for along time. I bought a eagle rotating kit and i think the rings it came with are not so great? Part number 40564cp.030
This is not a race car, just something that should make a reliable 300 hp. What i have now started wondering is what type of ring would be the best to put in....

Is there only one material type referd to as moly?
A chrome top ring?
Is there a Chromoly ring also?
Cast iron?

Thanks! Keith