hahahhaahahahaha $200
your forgetting a few major things
like why did the head gasket blow
u will also need a set of head bolts (as u cant reuse the old ones as nissan head bolts are torque to yeld bolts)
u need to head the head checked out (ie acid dipped ,new valve guides ,skim the head ,re-seat the valves etc)
other thing that might be needed
timing belt
idler and tensioner bearings
water pump
coolant
oil
oil filter
u cant compair the price of a head gasket repair on a falcon to a r33 skyline as a falcon dont have half the shit u have to pull off compaired to a skyline