Well guys, I am a mud bogger running a street class must pull 10lbs of vaccum. I have a 77 f-150 4x4 long bed, 38s, 5.13 front and rear. I have msd ignition. I am building a 466 with Kb flattop single valve relief, H-beam rods, scat crank. On the cam I have narrowed it down to the biggest 4x4 cam that comp makes. I haven't bought the cam yet. I am having problems decideding which cylinderheads. I have kind of weighed my options. I have narrowed it down to the TFS streets, edel. Rpm CJ, or the p-51. I was looking for something that was good for this class, but also something that I can grow with. I going to be running this motor for a while. When I am done with it, I will go bigger. I want some cylinderheads that will be durable and something that I can reuse down the road. Thank you, Any input would be helpful.