Custom is always the best choice, but you're looking at around $3-400 for a grind. If your P heads are untouched, you'll probably want something that favors the exhaust. Something like the TFS stage 1 (part number 51402000) is a pretty decent off the shelf cam that has a nice lopey idle and good powerband. With my TFS heads and Typhoon, it would pull strong right up to the redline. Decent off idle power, but it really comes alive after 3,000 RPM.