I don't think we can all give you a definite answer without having the set-up in front of us...
Only way to confirm is to test it yourself...
Run a (cheap) pressure / vacuum gauge and put it inline (T?) into all the branches and see how bad the fluctuations are.
Brakes should not be that big of a deal, since minimal fluctuations are not going to change the braking performance that much.
Also, very few functions of the engine depend on deep vacuum under throttle lift, so I don't see how this will effect the performance of the engine significantly in the first place.
If you don't have to worry about emissions, then just run all that crap open-air - you just gotta deal with the fumes smell every now and then.
-Ted
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