You are fixing to find out you are in worse shape now than when you had a broken bolt. A regular drill bit is not gona drill out a easy out.
In my book you have 2 choices short of taking the head to a machine shop.
Make a drill guide out of a flat piece of steel. Drill holes so you can bolt it to the head using the other exhaust bolt holes; and center a small 3/16 inch hole over the broken bolt. Get a "Rescue Bit" (google the name) and use the drill guide to drill down the center of the easy out. Once you have it drilled you can remove the guide and use the rescue bit to chip out more if needed. This still leaves you with the broken off bolt in the hole so you still have the tedious work of getting it out.
If you have access to a welder you can get a special rod called "Stud Pull" by Duratrode. It has a special flux on the rod that allows the weld to stick to the broken off bolt but not the head. So I do not have to type out all the details follow the link to a post about it a few months ago.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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