Hey, I have the a440 in my cruiser. I just don't think they kick down that well unless your foot is just so on the gas pedal. Yes you can adjust the 'lockdown cable' but at the end of the day even a healthy trans. might not kick down all that great. Remember that the a440 is fully hydraulic.
Hey, I have a 3fe. Nothing to mysterious about a coolant flush on the 3fe.
1) People use a t valve in the heater hose at the fire wall that allows you too connect a hose and flush as much as you want.
2) The block drain cock is on the driver side which will drain the engine block