If I were you, I would be tempted to do both. When I installed an aftermarket cam in my motor, I countersunk the holes, used red loctite, and ground off a little on the oil pump casing. Also, on the new oil pump, you want to make sure the "tine" (the thing that fits in the cam to turn the pump) is the same length as the old pump. On the high flow pumps, they tend to be a little bit longer and put more stress on the cam bearings.
I believe we had a member on the board that put together his engine without using red loctite only to have to tear down the engine at 3000 miles because the bolts had backed out and were rubbing the casing.
Hope this helps,
Paul
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