Variable hydraulic lifters for 440 engine

The temp sensitivity is normal.
I think your TC is working correctly.
I think ,at the least, it is not responsible for your low idle vacuum.
And,obviously, neutral works just fine, so the trans clutches are not mechanically dragging.

I would have expected the tires to rotate faster, and continuously, in neutral, at 1000/1200 but your rear brakes may just be dragging, or the TC is just loose, which for a 3000 flash-stall, is probably correct.
If the tires break loose with moderate throttle from a stop, and continue to burn with ever more throttle as the car moves out, then the stator is fine. It would be hard for me to judge, how much throttle opening would be required because I've never had a BB,lol. So I use the word "moderate".
But if the tires break loose at 1500rpm or 2000, with a 3000F-stall, I would assume the TC is not working right

Ohchit, gotta go, I'm late for work!
Ok , I'm back,lol