Apologies for some more off-topic content in this thread:
I found that, in addition to the kick-down being important, there is also a lot of variability between our cars in the point at which they will shift down under load. My own car for example would shift down fairly easily when I applied more throttle, or when there was say a small hill to climb. But, after the rebuilding of the engine, that changed quite a bit and the car became 'lazier', necessitating a lot more throttle, or even applying the kickdown switch or manually downshifting to get the same result. My conclusion was, since I had not touched anything on the transmission, that due to the rebuild there was more (or less, but likely more) vacuum being created in the intake plenum that the auto trans also connects to. So that, to get back to the same shifting characteristics, I would likely need to tweak the modulator that is on the trans. One of those things on my 'once I find the time' list ...
I still maintain this car sold for $100K more than it's worth, objectively and rationally. So to me it's a '$100K irrational premium'.