Here is my take and recomendations on this. Since the warranty on the motor is important (to Capo) do not do anything to the heads. Any head mods like porting, polishing, 5-angle seats, radius seats, guides, decking and the like will give the MOCO ample reason to deny any and all warranty claims on the heads or the posibility of future leaking head gaskets. Based on the discussions we had I recommended either the SE-251 cam or the Wood TW-7H cam with my prefered being the Wood product. Both of these cams will carry out longer than the 255 that is in there currently. Also stay with the hydro chain drive, sure gear drive is better but with the runout issues on these cranks its not a good fit without further bottom end work.