318 cam

I’ve seen some rotators on single groove valves before, but most of the aftermarket rebuilder engines (and a lot of stock 360!) have two groove exhaust valves. If it’s got the rotator setup with two groove exhaust valves, you’re better off just having another set of heads to put on. You won’t actually know which one is under the rotators until you take one of them off, so it can be a crap shoot.