[Spridgets] first post/blown head gasket?

[ryan.kubanoff at comcast.net]

My first post!

I am Very new to MG's and I am reviving a long mistreated 74 midgit.  This weekend I took it out for a nice drive and other than some occasional bucking that i attributed to water in the tank (i live in PA) she drove fine.  But when I got home I saw that I was leaking antifreeze out from under neath the overflow bottle cap.  Once the car cooled i heard a gurgling sound.  when it completely cooled I opened the radiator and saw that it was filled.  The coolant was nice and clear/green.  And the oil was also clear.

I have blown head gaskets in other cars (nissan sentra) and when I opened the radiator it looked like pudding, but an all experts.com mg car repair site said it might be the head gasket.

the temp never registered other than normal and my oil pressure was fine. 
any ideas or is it something as simple as the cap isnt on tight enough?
thanks
ryan