I have arp head studs and shimmed 910 comp valve springs, smith brothers pushrods. I also have a stage one gearhead cam and ported heads but I only did that because I had to change my front covers and it was right there. Jury is still out if the cam helps, but defanitely not worth pulling the engine just to do it. Im sure I could be at 500hp easy if I increase my oil pump output. Im looking around for a good deal on some old stealth pumps, I had a set before and liked how they ran. My truck falls flat on it's face above half throttle