Upgrade to 273 S (Commando) cam?

I have a '65 Barracuda 273 auto 180 hp and am considering an upgrade to S (Commando) spec cam and 4bl carb. Will this require upgraded pistons too?
Summit can get a Howard cam that is very close to the Commando specs but not identical. Does anyone know where to get a Commando spec cam (.415/.425 Lift and 248 Duration)?