Head Bolt Torque?

Hay Guys! Been working for two years on this engine and finally got it started last weekend. Fired it up again today and noticed a coolant leak on the head gasket. two questions: 1) Is it possible to jsut torque the head bolts down to stop this? It's only ran for a total of about 20 min. (note: the engine rebuild shop installed the head) 2) What is the torque for the slant 6 head (1975 duster 225).

Thanks....Ozymail