Please read this

[84LX89GT]

First off, did you reuse the same spark plugs that were coolant fouled? It's likely they're covered in coolant, especially after removing the head. Also, coolant from a blown head gasket will get into the exhaust and it has to be burned out. Coolant on the block also takes some time to burn off and will have lots of smoke. What i would do is replace the spark plugs, top off the coolant and restart it with the radiator cap off. If bubbles are flying out of your radiator, something isn't sealed.
Did you have your heads surface milled so that they're completely flat? Did you check the flatness of the block (not as likely warped as the heads). It's very common especially after overheating/head gasket failure for aluminum heads to warp.
Did you use new head bolts? They're torque to yield so you can only use them once.
Also if the intake isn't sealed correctly it will cause coolant to get in the cylinders.
I'm not sure what procedure you used for replacing the heads so i'm asking every question i can think of