That crazy reed valve Biturbo kit on 1977 looks like it matches the stock case, but its probably not the best choice for a first kit. You'd need to fab up an exhaust and get a new carb.
You should port match the Malossi kit to get the most out of it, but because the ports mimic the stock ones, I can see why people would say you can run it unmatched.
DR and Parma kit are nearly identical. Parma might have a slightly larger exhaust.