Engine now smoking after new valve seals

standup303 said

Nothing has changed other than the valve seal bosses were cut lower and narrower then new seals installed by a machine shop and built back up by them.

White/grey smoke out the tailpipes, pretty thick smoke too. Definitely doesn’t seem like steam.

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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.