I took my block to the machine shop and I got it back and now there is a hole that I dont have a part for. It looks like a freeze plug hole but it is smaller and is located behind the timing cover above the oil pump on the left hand side. A pic of a block identical to mine is below. It is the big hole on the left hand side right above the oil pump. If you can shed some light as to what goes there or what is the purpose of that hole I would really appreciate it.

http://www.2gnt.com/www/corbin/rebuild18a.jpg
Is that small grey plug what you are talking about?