Only one drain plug on a 350 that's the oil drain. on forward part of lowest part of pan.
The radiator will have one depending on model on where it is.
New answer- There are 2 water drain plugs on all V8 blocks, And you can find them
1 on each side of block, They our in the center of the block just above were the oil pan bolts on the block. They will be real short and takes a 1/2 inch socket to remove.
On the engine block. where on engine block?
It is located on the side of the Engine block.
Underneath the engine block.
under the hood
on the buttom of the block Can you please be more specific? Where exactly on the bottom of the block? Near what on the block?
Inside the bottom of the engine block.
in the engine block
Rear of the engine block, near the oil pan.
its located at the rear of the engine (center) attached to the block
There are multiple expansion plugs in the engine block.
Bottom of the engine block on the oil pan.