I had that problem as well..drive around all night, put it in park and boom 1100 rpm.
WTF, I left my garage and it was tuned for a nice 850 RPM in park.
So what gives? [ I haven't driven car to that extent in ages ]
I guess that is the time to tune it down when the engine is really at it's peak heat.
Sometimes I see street cars at the race way .
They have their cars @ 1300 rpm in 1st gear or so..they stage ...
then go to stall speed and haul ass down the 1/4 mile.
If you asked them to make it streetable , turn it down.. make it idle what it can...there may be that gap of responsiveness that can't be obtained.
Or they'll see perhaps what you see now?
the only vacuum test I know of is spraying around the carb base.
I have no test to verify if one's intake is leaking.
make sure brake booster hose is good and not so secure that when the engine moves that it pulls on the booster housing, thus letting valuable vacuum out..thus a leak really..
little things.
That's my stab at this.
If I could I'd switch jobs to do engine building like some of the guys here.
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