I've got Comp Cams rockers on my 331 stroker. I was shopping around for the lowest priced set, but after talking to a local race motor builder, he advised against going the cheap route on rockers. You get what you pay for. Also since you have screw in studs and guide plates already, I'd shop for a set of 1.7 rockers to increase the lift at the valve a little, they'll cost the same but you'll get a little more performance with them. Just make sure that with them, you don't exceed the max lift for the springs and you order them for the size studs you have ( this will be either 3/8 or 7/16)