It will be more expensive than most in the case of the head gaskets because the engine has to come out of the car... and there are two cylinder heads.
I'd say ballpark $2000 if it's a very simple job. Lot's more if the mating surfaces are not within tolerance. A lot depends on what else needs
replacing too... if you want the car to be leak free and reliable for a long period, you'd be looking are replacing the cambelt, idlers, water pump,
oil seals... it can go downhill very quickly and end up being much more expensive.