Antifreeze leak on header flange

Ok,.... Strange question....

I was replacing my leaking back up light switch on the 833 transmission in my '67 barracuda last night. I was reinstalling the inspection cover that I removed to clean where the leaking lube got between it and the trans, when I brushed across the pass side header collector flange and noticed it was wet.

I had been noticing a small puddle of antifreeze here and there, but only if it sat for a while. I started looking and it seems to be coming from the back right corner of the head, and actually looks like it is coming from the header flange to the head. I immediately started thinking "Great,... I've got a bad head gasket or something", but something occurred to me this morning.

Do the exhaust bolts go into the water passage on 906 heads? I swear that years ago I remember antifreeze coming out of some of the bolt holes when I was changing header gaskets on the 440 in my Charger. Seems to me we put a little high temp RTV on the bolts when we put them back in.

Is it possible I have a loose header bolt and antifreeze is slowly seeping out when it sits for a while? I will have to take a look at it tonight and see if the header bolts are tight.