It would be a bit slower thru the block(at the same flow rate), but there would deffinately be less restriction thru the block as well, meaning more flow thru the system. You *might* get equal speed, or possibly higher, due to the less restriction/more flow. I'm not quite sure on that.
If the shop would do it, you could get them to add turbulators of some sort, perhaps by using a smaller bit & cutting shallow channels (like the Maze 3, i think??).
But if they have the choice between milling the channel, or just machining the base, they would most likely machine the base down as it would be easier.
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