In cleaning my throttle bodies on my 1988 V12, I noticed the two A bank vacuum hookups at the top at the butterfly, even though the hookups are the same size, the ports inside the throttle body - one is a tiny hole and one is much larger. (these are for the throttle edge tapping)
My question is, which one should I use for my vacuum advance regulator? I’m assuming the larger hole will make it respond faster? Or will the larger one have a bit of vacuum at idle, since part of it is behind throttle butterfly? Or does it crap matter ?