1985 dodge 600 turbo white exhaust only on startup

This usually indicates worn valve seals, when you park enough oil drips onto the pistons and when you start it, the engine burns off the oil first.
I don't think the parts are that much but the labor can add up
Ask if they have the means to replace them without removing the head, this means they use air pressure in the spark plug hole to hold the valve in place while they replace the seals,this way it is a same day repair and should only take a couple of hours