The lift will be determined by what CFM the heads are producing at different lift intervals on a flow bench. Example = they flow test and open valves .100, .200, .300, .400, etc. If your heads are producing gains of over 10 CFM all the way through to .500 lift opening at the valve then you can safely go up to or below .500 lift on a camshaft before over saturating your head ports. Because you are going to be running a stroked engine crank this allows more piston travel distance from head to crank which means you can have a slightly longer duration that the camshaft will allow the valves to be opening for. The LSA (lobe separation angle) will allow for more or less overlap between your intake and exhaust valves to be opening. More separation angle equals a smoother idle, and less angle equals a rougher idle. Maybe this will help get you closer to a decision. Or maybe its just entirely wrong and useless information....lol. Good luck.