If the owners manual spec for the coolant just says 'ethylene glycol' - then I believe it's ok to use green, which I have done on numerous Toyotas of that era. Be sure to flush the block and radiator with distilled water first to completely remove the old coolant mixture.
If you purchase Toyota coolant, be sure it's the older 'Toyota red' and not the newer premixed 'Toyota pink'. Not all parts departments are paying attention to this. The pink is more expensive, and a different formulation.
Steve H. - KE0KNH
Colo Springs, CO
'78 FJ40, '89 FJ62, '98 4Runner