Listen to these guys, they are pointing you in the right direction. They've "been there, done that". Use a good single plane and go for the AFR heads. They are just plain superior. Cometics are excellent head gaskets. I used a cog because I am a psycho case, but both Jody and Blown have used the serpentine and (I think) it worked for both. I highly recommend talking to Tim at Ron Davis for the radiator and intercooler, but be forewarned, none of this is cheap. Obviously, you are looking for the biggest bang for your buck, but to reliably obtain high horsepower, there is always expense. Do what you want, but remember, if you can't get it to the ground, the higher the power the WORSE it gets. The 'ol sliding versus static friction game.