That 1HZ looks right at home in the 40's engine bay :).
For the tires, I think your best alternative would be 31x10.50 on a 15" rim or 285/70R16 if you want to go bigger without a suspension lift. If you want to go smaller, 265 on a 15? rim. Anything smaller will cost you ground clearance. These 40s have massive clearance robbing diffs. Dunlop, Bridgestone, Yokohama are on the expensive side but GT has some very good and very reasonably priced tires.
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