[JustOne]

DD,
The Blue Thunder heads you see there are closer to a Yates style head and they are for racing only. A couple of the TFS heads you see are ported by TEA, and you can see the difference vs. the stock TFS head. AFR is different than othe manufacturers because all of their heads come fully CNC ported, which makes a huge difference. For example, my Avenger heads (Edlebrock Vic.jr) now flow the same as an AFR 225. You see a lot of people go with the AFR because they are an excellent value when you compare their price to a stage III race head.
If I were in your shoes today I would build an AFR based motor. There have been so many articles on which combinations work, and most of them are in the articles section on the airflowresearch web page. So just copy one of those combos and go from there or call Ford Performance Solution, Panhandle or Keith Craft. Don't just go to you local machine shop because these guys have most likely not dynoed combos that they know work.
My car was also built for road racing and auto cross, so I had to go with a more radical custom cam to move the powerband up in the RPM range. The problem then becomes idle, which we hope to have solved with a larger lobe seperation on the cam. My advise is to get a custom cam ground. You should be able to get 400 - 425 HP and still have a nice street car if you go with an AFR, Edlebrock, Canfield, TFS, or Brodix head. My engine was built by Ford Performance Solutions F-P-S.com in CA. Troy at FPS found me a 69W block and spent a lot of time with me going over combos for the motor, which is the second one he has done for me, and he puts out a good product at a very reasonable price.
As mentioned earlier I would purchase the carb from Don Gould and let him know what your combination will be. He will also put road race floats in your carb if you tell him you want to use it for track days.
Good luck searching for your combination, this is one of the really fun parts of the build. Call as many builders as you can to get different opinions, because just like kit builders they all have their own way of doing things.