Hey Kountz430, after trying zillion way over many years, I found the cross buff to be the best to start with if the parts is not to rusty, they will de-burr any parts wether it's casting, fuel rail or valve cover. if the parts is really rusty, sandblasting the parts will save you hours of works. For the cross buff you will need either a high speed drill or an air tool.
I prefer the air tool since they are lighter to carry and will draw less fatigue when working long hours, but the high speed drill has more torque for casting part, like spindle, wheel hub etc. Make sure to wear eye protection, as small particule will fly away and can easily injured your eyes, trust me been there done that, dont take short cut and your work will be awesome and you'll be safe.
Start with a rougher cross buff like the blue one and then smooth it out with the red one.
There is many place that sell those like here:
http://www.tooldiscounter.com/ItemDi...e&kw=STD265008
or here:
http://www.americanbuff.com/productdetail.asp?id=1006
Then if you really want to make a pro job you need to buy a polishing kit, found here:
http://www.caswellplating.com/buffs/index.html
If you dont want to spend much money on a buffer, buy a 3/4 or 1 HP bench grinder ( I got one at Canadian Tire for 69$CDN wich is about 40$ US ) I'm sure you guys have similar place to buy cheap in the US ) a good suggestion is to also order 2 shaft extender from Caswell:
http://www.caswellplating.com/buffs/shaft.htm
Those will extend the bench grinder shaft to a wider stance and it will make it easier to polish bigger parts like a valve cover.
At last when you polish with compound get ready to get dirty so wearing the proper clothing is the way to go, if you follow some of my advice you'll achieve awesome result, but it's not a job for the faint at heart, so be ready to work long hours and you will get incredible result.
Good luck and feel free to contact me for any questions, I'd be more than happy to share my passion with you.
Best regards from Canada.
AA