Heheh, you might be surprised how quickly tubing adds up...I have ~10-12 feet in Zeus...that really came as a surprise once I started actually fitting it.
Nice score; lots of shiny.
I would not recommend using an air compressor on the rad; I would be concerned that the high air pressure would damage the fins. To clean off my rads, I use a small brush attachment for my vacuum. In absence of that, a small brush or cloth to loosen the dust and just a normal vacuum hose should work fine and not risk any damage to the unit.