Whew... Glad you caught that. Non-stock and frankenbikes are a special issue on this forum. You could double-confirm-check by counting the teeth on the crank, best done by dropping the bottom sump plate to see it. 256/306 will have 17 teeth (half of 34), 447 will have 18 teeth (half of 36).
I've never messed with pressing on/off cam sprockets, but have the tools to do it someday. Other members here have done it, but requires meticulous precision. Try a forum search 'sprocket', or the google search feature "cam+sprocket", to get an idea of what's involved...