Before you go spending lots of money on a kit you might want to try some Mother's Mag and Aluminum polish that you can buy at auto parts stores. I have used that stuff to polish numerous parts on my engine and it works great. It is around $7 for a large container of it. They have a smaller container for around $3-4 I think. Just a thought!
Kit is only 10 bucks from Home Depot and attaches to your drill 3 bonnets and 4 bars of 3 compounds. It just takes the work out by using your drill rather than hande. I use the Boyd coddington metal polish which is the green liquid you cna find on the net for 10 bucks works like a charm.