Classic/Antique Car Repair: water out tail pipe, head gasket, humid weather

Question
When I first start my 1955 Chrysler 331 HEMI Water comes out the right only tail pipe But after I drive it for a while I leave it run but no water comes after driving a while.   What do you think?

Answer
Where do you live? Florida? Humid weather--->Condensation, Water is a chemical byproduct of combustion. If it were coming out all the time I would lean towards head gasket, But if just a little then it stops I would not worry much. I have a vette that does that.

Mike