lower intake gasket repair estimate on 1998 GMC 1500 Pickup

What is a ballpark figure to replace a lower intake manifold gasket on a 1998 gmc 5.0 2wd with a/c.

Asked by for the 1998 GMC 1500 Pickup
4.5 hours labor
gaskets are around 28
add an oil change
add a coolant exchange as well.