Must be smaller than the 268 cams used in Chevy 350's and ford 351w, my buddy's 69, 351w made 346hp with a comp 268 cam, rpm intake, 750 Holley, with the stock heads light bowl work 1.94 valves. Those heads even with the bigger valve and bowl blend probably flow less then a 1.88 mopar head, not to mention the flat intake port along with the flat intake manifold runners.. The carb is about even with the top of the valve covers LOL