ive got a 66 cj-5 that no matter what ive done still get water in the oil on 1990 Jeep Wrangler

I had a machine shop check and shave the heads , I also replaced the intake manifold gasket and head gaskets and still get water in the oil. this jeep has the AMC 304 motor in it . any ideas?

Asked by for the 1990 Jeep Wrangler
poss crack in cyl heads or block?