what year corona?, is the box u speak of the W50 - W57 series?
if so then u will need a custom bellhousing from dellows or other such places. Before you buy a 'dellhousing' do a search on other people opinions of the dellows craftsmanship (especially mrshin hehe).
also search forums for the W58 --> 4A-GE swap that'll give u a bunch of info.
by the way ive yet to see your beasty round campbelltown, but am always keeping an eye out for it.