If you have engine and trans already,
You would need,
V8 cross member (VN or later as they have more clearance around the rack for exhausts)
Transmission cross member
Drive shaft
I would highly recommend a VN/VP 808 and matching wiring loom to suit V8. You will need the matching Distributor (there are different distributor plugs for the later engines.
V8 pedal box assembly (possibly, I'm told the throw out length is different between V6 and V8 but would need to confirm)
Clutch cable
Headers/exhaust
Radiator and all associated bits
Front struts or upgrade existing struts with correct springs (heavier engine)
Possibly a different dash as I believe the tacho might read wrong.
There are probably more/other bits but you'll discover those as you go but those listed above should be all the major items required to get it in and running.