Replacing valve cover bolts, coolant coming from hole??

[Premium72]

So i was tinkering around cleaning some things inspecting some things today, i pulled the valve cover gave everything a look, slapped the cover back on, as it happens many times to more than just me..im sure, some gremlin stole one of my cover bolts..ha, just slipped out of my hand fell thru the truck somewhere, and i couldn't locate it, i had a few valve cover bolts form my 6 that was in my 49 coupe, they were just a tad bit longer, maybe 2-3 threads longer. So I put it in its place,i hand screwed in, then with just the speeder wrench to snugg em all up. I noticed the one bolt was leaking.. i pulled them all out, and noticed coolant coming from the hole?? WTH?!

What did i do here? Seems as i may have went through the head gasket? is this possible. Im just learning the ins and outs of these 6ers, so please excuse my ignorance fellas.

What did i do how do i fix it?