This is what's included in most PI swap kits. Maybe someone else can chime in and say which of the following ESSENTIAL for the swap to work (I doubt that all these pieces are REQUIRED)
Intake Gaskets
Thermostat and O-Ring
Thermostat Housing Bolts
Heater Hose (for the different runner length of the PI Intake)
Heater Hose Nipple
Alternator Bracket and Bolts
Dipstick Tube
Camshaft Bolts
Head Gaskets
Exhaust Gaskets
Valve Cover Gaskets
Timing Cover Gaskets
Water Pump Gasket
OEM Ford Head Bolts