My vehicle is a 1979 Chevy Van 30, it smokes badly, runs well, can you repair it on 1990 Chevrolet G Series Van (G30)

This problem started Saturday when I started it up, then after it idel for a while, I began to see smoke from tail pipe.

Asked by for the 1990 Chevrolet G Series Van (G30)
what color???

black is running rich
white is burning coolant
blue is burning oil.

and yes, it can be repaired but the price depends on what is wrong

The smoke is white.
Where are your shop located?
I live in Deerfield Beach, Fl. are you near me?
looks like you are burning coolant which means a possible head gasket, cracked head or maybe an intake manifold gasket.