leaking like a sieve!

just installed new head gasket on demon and fired it up after a month, all great til i looked under car and trans fluid was running pretty steady out of trans (727) inspection plate, any ideas on what i should be looking for when i pull it out again. i just installed a hughes 3000 stall converter about a month ago and yes i was dumb enough to run it with too much trans fluid, about on inch overfull on dipstick...let me have it!