Exactly my point. The only thing that is different is the new head (and intake) gaskets.
Oil is blue smoke, coolant is gray/white.
Sounds like you may not have gotten the deck surfaces as clean as you hoped and the head gaskets didn't seal. Run the compression and cooling system tests.
Just my guess with the information at hand.
Thank you for the info. I’ll run a compression test and have to look up how to run the cooling test. I have no concerns regarding the head gasket install but was definitely easier with the block on the stand versus in the vehicle.