Generation III Internal Engine - Really need help. What else could it be

Few weeks back, the car had a cam, valvetrain and lifter swap done. Shortly after dyno time, the car started to over heat and blow white smoke. Lost a head gasket. Well come to find out, the heads were a little warped. Some time and $$$ later...few days. The car had brand new ARP's, head gasket with re-surfaced 243's. Well that was short lived...car is mixing coolant and oil now. WTF? :bomb::mad: What else could it be? I know the head is not moving due to the ARP bolts and I purchased brand new head gaskets along with having the heads machined. I am stumped. Any suggestions and advice welcome.

Coolant and oil would be a crack lower in the block, like a head bolt hole that had fluid in it during bolt tightening.

Or a cracked head

Well that's comforting lol Thanks for the replies