Order directly from Kauffman.
www.krepower.com
For a mild build, no real reason to do any porting, their as cast head with a mild hydraulic roller will sit your around 500hp plus or minus depending on what cam you end up with. You do have room to grow later on if you want or need.
I just had my KRE D's refurbished last year and went to their 310cfm port and port matched my torker II manifold. With a .6" lift 240/248 on 112 hydraulic roller, spec'd by Jeff, the engine made 580/600.
The KRE heads were one of the better upgrades I've made over the life of the car. One thing to note is that they do not have an exhaust cross-over on them. If you're running a carb and utilizing the vehicle in cold weather, you may lack some of the streetability you would otherwise have. An Edelbrock D port may be a better choice if the car is going to be opperated in winter environments with a carb. Should you decide to run any of the throttle body injection units, the lack of an exhaust cross-over works to your advantage.