Ok..it's your money

Internal harness for your year/trans (shouldn't need)
4th clutch hub (should be ok, but you want parts)
Get 4th clutches and steels (steels are likely cooked)
Channel plate gaskets
A jug of Dave's special sauce for transmissions
Side cover gasket (I doubt you'll hurt it)

Once you see pricing on the harness, cover gasket..you'll figure out that you don't actually need them.