Single pattern cams seem to work just fine in a lot of engines including most OEM engines.

I just finished up some camshaft testing in one of my big block motors where I was using a Comp MM 293 single pattern cam. It made 660 hp which is a decent number for an inexpensive flat tappet cam. This is with Edelbrock RPM heads which aren't noted for having a fantastic exhaust port. Maybe a dual pattern cam would make more power, maybe it wouldn't. Point is that 660 hp is enough power to put most Mopar race cars into the 9's. So for a typical bracket racer, why mess around with a bunch of cam theory when a simple cam off the shelf will run plenty hard.

440Jim runs a MM 305 (single pattern, flat tappet) shelf cam and he is knocking on the 8 second door.