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If you were to block the 3 small holes (patent plate fasteners work perfect) and put in a seal, your crankcase is going to have to vent somewhere.
Some people will use the timing hole behind the cylinder, using an alternator wire tube from the primary (same thread). That can be messy, it's in the windage of the crank. Some will fit a tube onto the timing cover, less messy but more obvious. I did mine through the "nose" of the crankcase, using that cavity as a baffle. It works great.
Earlier models (pre 68) used a timed breather ran off of the intake cam.
-Ben
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01 Bonneville, 56 Thunderbird, 68 TR6, 71 reversed head Bonnie (chopped), 79 HD Shovel, 67 MW Benelli 350 single, 46 BSA C11 plus many piles and projects.
http://www.bendavanza.com
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