$1400 in addition to head gasket repair is ridiculous. The timing components are removed in a HG repair. The only additional cost would be the belt, pulleys, water pump and thermostat. Maybe a couple hundred. Seals should be part of the HG repair, even the cam and crank seals.
I think the shop you have it at is adding too much labor.
I think the shop you have it at is adding too much labor.