Classic/Antique Car Repair: 29 model a truck, combustion gasses, good luck jack

Question
Jack,
I have a 29 model a truck.  It runs like a champ, but is running hot.  I don't drive it much, just run it around the yard once a week to keep it in good order.  I took it for a 1/2 mile drive today and I noticed a little steam.  When I parked it, a small amount (less than 1/2 a cup) of cooland came out the overflow and a little more steam.  Of course the shell was hot to the touch.  As always, I did check all the fluid levels before starting it and the coolant level was fine.  What concerned me was that it got so warm on such a short drive.  I read one of your previous answers related to radiators, but just wanted to get your thoughts.  There is a reliable radiator shop where I am, but I didn't want to just take it there if it might be something I am doing wrong.  Any information you might be able to give would be greatly appreciated.  Thanks.

Answer
It could be the head gasket letting combustion gasses into the water jacket.  That would cause what you experienced.  If you read my big thing on the cooling system, that says it all.  I think most of our radiators are plugged and we won't admit it.  I'm going to go back and try to figure out what I said that you read..  I add more later.
jack

Troy, I did include all I know about radiators in that other answer I gave.  
Check the torque on the head bolts, but be careful of the two that are in the goose neck.  Only go to about 45 ft. # on those two.  You don't want to crack the casting.  Make sure you timing is correct.
Beyond that, I bet your rad is plugged.  The test I use is, if it can go 2 or 3 miles at 45 mph without boiling over, it is a good system.  That is a tough test, even in cool weather.
Good luck.
jack