We are arriving by auto and hope to park in the International Terminal parking lot. How much time should we allow for parking, customs, passport control, TSA screening and check-in on KE 1:00 pm flight?

So you know, the international terminal doesn't have economy parking. You'll have to pay the more expensive daily rate. I usually park off-site and take a shuttle because I'm cheap.

I would plan on being parked 2 to 2.5 hours before your flight. Security at the international terminal usually goes VERY quickly, and you'll probably have plenty of time to wait. But once I did encounter a badly managed line and it took about 20 minutes. You don't have to go through passport control or customs when departing from Atlanta. They'll verify the passport at the ticket counter where you check your bags.