The only downside on the roller rockers you've listed is that they are cast and not forged. As long as your not running a blower, turbo, real high RPM's or extremely high compression they should work fine although they seems a tad expensive. If you do end up running a turbo or blower, you could replace the exhaust side with a forged unit. Extruded are ok as well but they are extruded with the grain running transverse to the longitudinal axis. They are better, but nowhere near as good as a forged unit. Stainless steel are also very good but heavier (that's what I use). Pushrod checkers are available from Summit and Jegs and are easy to use. Enjoy!