[Gaz64]

Anthony,

If the intake runners are plumbed with 3/16-1/4 tubing into a common log, you can then have your map sensor and power brakes from that.

Technically the vacuum readings should be generally the same, camshaft dependant.

Rate of throttle response is linkage dependant.
You don't want throttles that open too fast off idle, or are difficult to open.