Seems like there are are lots of you on the board here who have run a variety of FC types through the years so maybe you can educate me. FC bodies have evolved. Current fuel FC bodies look odd with the really streamlined roof lines and huge built in downforce areas in rear. Understandable given the speeds. TAFC bodies look less extreme and smaller. Nostalgia FCs also look somewhat smaller but maybe not. Love watching them run as I’m a product of the 60s racing. So in concise terms, what are the differences and requirements among them? I assume you cannot interchange them between classes (like put a current FC body on a nostalgia car)?