Looking for sources for a good marine cam for my 292 boat motor. Or can I use say a comp cams with around .500 lift, 270 duration? What should I be looking for as far as specs for marine cam. ? Also is there a formula to calculate hp using known improvements to engine i.e. block deck,, mill head, .500 lift cam ,msd box etc. BTW guys decked the block .30 , Done. thanks Dave