i'm having a fresh new 355 put in and was wondering if i would need to get the heads rebuilt as well. they have 150,000 miles so i'm kind of expecting to do it, but b/c of money i really can't spend a whole lot. what would i need to complete the heads, would i need to replace the valves, or what i need some advice. by the way i'm putting in a hot cam so i know i need springs.

thanks for all your help