I never drain the coolant out of the block Kelly. Can make bleeding the system a 'mare.
Its on the front of the block. 14mm bolt from memory, to the right of where the oil filter is located as seen here: http://www.tercelreference.com/tercel_info/component_library/4efte_block_1.jpg
Yup, you can see the other one on the right too.
I don't use them Kelly, would imagine to do it right you'd need both off but depends what you can do.