How far down in the hole[deck height] are the pistons? and what part number is on the top of piston?,and your heads,are they milled[shaved] or stock combustion chambers[cc's] stop worrying about the castcrank it'll take alot of abuse,never seen one break yet...you need to know the heads cc's and your piston deck height to determine your compression,the cam you have is decent, alot of people running them,the more info the better for you and people trying to figure for you...dont be afraid to ask,I've asked alot of my own ??'s in the past and will again if I'm not sure....another thing is what tranny and convertor,gears,chassis set up[stock or modified like ss springs,frame tied,shocks etc]