Im interested in building a better breathing head for my svt. I was wondering if anyone can give me somewhere to start. Im quite confident i can perform the work on my own however im not to sure where i could get a head besides local junkyards. Also has anyone gone down this path, P&P, stiffer valve springs, maybe oversize valves, possibly milling the head to raise compression.. any input will be greatly appreciated. My end goal is to add nitrous to the picture .