[btwilson86]

To do it properly, you would have to remove the block because you would also have to remove your rotating assembly (crankshaft, pistons, connecting rods). This way the block can be dumped into a cleaning bath so it can be inspected for cracks and other defects. This also gives you the chance to do a full rebuild on the car, so you get a nice clean start for your upgrades.

If you are fairly confident in the bottom end, you can leave the block and the rotating assembly in the car. By doing so, you'll be taking all of the labor of smoothing the surface into your own hands. It'll take several hours, but it can be done.

There are 2 threads that I've read that seem to be fairly informative on this topic. The first one, they decided to smooth the block by hand. Check it here. The second one, he took it to a shop and had it dunked. Check it here.