I am getting a little hesitation or stumble off idle (when I am in gear, under load, but not when I rev the motor in park or neutral). I have a rebuilt 292, 12 volt system, 55 Fordomatic, no binding in the linkage, rebuilt carb (the carb is a small 55 2 barrel - original), and a 57 and up distributor with ACCEL pointless ignition.
The car starts and idles fine, and revs fine while not in gear. But I have to feather the gas when she is in gear, because off the line she hesitates a little bit. Could this be the power valve in the carb? I did replace it when I rebuilt the carb just 2 months ago.
Hoosier Hurricane - I took out the 55 for her maiden voyage last night, and you were right on about the "overheating" problem...she settled down just fine when we were moving, right around 190.
Dan
Daniel JessupLancaster, California
aka "The Hot Rod Reverend" 
check out the 1955 Ford Fairlane build at www.hotrodreverend.com