I bought a set of GM L31 Vortec heads, but now I'm second guessing because now I really don't know if I want to buy the SDPC intake (TPI). I really think I might want to sell them and go with a set or World Products heads for my 350 buildup. Unless this makes some sort of bad*ss setup (like the SDPC website says), I have a hard time justifying paying almost $500 (with EGR install kit) for just an intake. If anyone has this setup, I'd like to know if they are that happy with it and if they would do it again. I've read lots of ripping on the setup here.