I got the same set up with no issues...copper head gaskets o-ringed...NO LEAKS....did you use any sealer around the head studs ? have you tried Haylomar on your head gaskets.
How bad is your leak ?...if the above don't stop it I would have to get the block decking checked out along with the heads the next teardown.
jmo
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "