valve job price?

[Grim Reaper]

What color is the smoke?

Blue is oil
White is coolant
Black is gas.

Too rich (black smoke) will make you plugs black. A valve jobe will do zero to stop that. You need to fix that with the carb or possibly ignition.

If oil from bad valve guide seals then the plugs are more likely to have a brown deposit build up if it clears out after being started. If it continues to smoke for quite a while it might be time fore a complete rebuild. If it smokes for a few second and then not noticable then you need some umbrella seal and a set of valve cover gaskets and some education on how to install them without pulling the head. It's a $50 job if you have to buy the hose to connect it to your comperssor. No air compresson and you can do this with some rope.

If it's white smoke and you loosing coolant then it's a blown head gasket or cracked heads.

If this is a pre unleaded fuel enigne and it's anything more then valve guide seals....get a set of vortec heads. It's not going to be much more to do that then get your heads done with hardend seats new guides and good three angle valve job. Unless your motor has big valve camel humps the vortecs will out perform anything you got that is stock.