Hi
You will need a manifold, a 4-2-1 is good for mid range power, a 4-1 is good for top end power, so get the type to suit your driving style. Have a look at TSR, or look on e-bay, as they are not cheep. If you are handy with a welder, you can cut and shut a MK1 to a MK2.
Happy hunting
kraM