Before you do anything, you need to first determine just where the moisture and water are coming from.
With tar on the interior walls, it should not be coming thru the block.
That said, I have to ask just how you finished your walls?
Did you someone tell you to place plastic sheeting over the studs? Under the drywall?
If so, what you may be experiencing is the direct result of having platsic on the walls.
Here is a helpful link to help resolve basement water issues:
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