I'm cleaning up a couple 906 cylinder heads for a stock 400 and found a couple intake ports with some rust scaling. Someone obviously stored the engine outside and allowed some water to pool in a couple ports. What's the easiest way to eliminate this rust scaling??? Do they make tiny wire wheels for die grinders?? I'm trying to avoid a trip to the machine shop, as these heads and engine will just be used temporarily to get the car on the road while I build the 470ci replacement. I'm hoping to clean the rust up and salvage the seats with some shade-tree valve lapping.