Will we need to increase the size of the throttle body and injectors on a system like this that can flow much better than stock?
The idea of this kit is that it will be a bolt-on piece. You will be able to run everything else as is and get a noted improvement. However, as is the case with any mod, the more you do to compliment the kit, the more you will gain. The hotair cars are pig rich with fuel to compensate for higher temps in order to reduce detonation. Thats why you saw the 10hp jump when we took some fuel out on the dyno, leaner is meaner to a certain degree. So, the stock injectors and 86-87 throllte body will work just fine, there are intercooled 86-87 guys out there running 11's on that stock TB, and while I recommend bigger injectors when you start leaning on an engine that hard, it has been done without them.
Will the heads need to be ported in order to get the benifit?
What we found on the flow bench should answer your question here. The intake will flow all that the heads can handle in stock form, meaning that it can't get any better than this with stock heads. Obviously if you were to gasket match/bowl port you will get more flow. But, again it isn't a necessity. That being said...Bigger heads are going to make more flow. I think the true potential of this kit will not become apparent until we get 8-10 of them out there and guys running different combos and trying different things. Just as it was with these cars when they were produced...more guys modding them in different ways made us all get wiser and faster.
As far as tuning goes, I think there are a lot of misconceptions here. Tuning a car is just a matter of maximizing the efficiency of the combination that YOU are running. If you have a stock car, you will need to tune to that setup. So, no additional parts are necessary to tune that car, however, introduce say an adjustable FP regulator and better exhaust, and now you have to tune to the max potential of those additions. SO, to truly "tune" this particular combo, you need to consider the other mods to your car, and either try different chips/fuel pressures, or work with some one who is a good chip burner/tuner to maximize your performance. Again, I refer to what I said earlier about no tfinding the true potential of this kit until several people have tried their "tricks" and seen what comes out of them.
Sorry to write a book here, but I am hopefully answering your questions.