I figured when I said tube K frame, tubes would naturally be every where else as well, but, I didn't mention it. Those struts also come in aluminum as well. The light weight calipers are a great idea as well.
Expensive? LOL what isn't these days. Step up or be happy where your at. Actually, that is the question! Going fast isn't cheap. Doing it cheap is hard. Getting the car as light as possible makes it easier for the engine to achieve more with less.
Or you can just build one freaking wild poked & stroked aluminum upper half ported & cammed to high high heaven engine and run it in a regular car and go fast.