i was looking at the timing cover and the gasket and it does not look like it will cover it very well and i dont have my old block to see if it had the same hole does it get some kind of plug ??? and if so does anyone know a part number also does anyone know the part number to the little plastic barbell that goes on the back of the block i lost mine.

 

yes it gets a plug

 

Yep, looks like a tiny freeze plug that taps in there with a small socket and smeared with a bit of rtv... Thats you're oil galley... All the way back is a tiny plunger plug on that one... Look back behind there and see if it's open or has a off-white plug in it currently...

I'll look harder later but this here is the general idea.. http://www.ebay.com/itm/LS1-LS2-LS6-LS3-LQ4-LQ9-Engine-Block-Plug-Kit-COOLANT-OIL-GM-/130902231125?pt=Motors_Car_Truck_Parts_Accessories&hash=item1e7a618855&vxp=mtr
its the little one on the bottom left...

 

so the tiny plunger in the top of the picture is in the same passage just the back of the motor and i should be able to see it back there without taking off the cover

 

No you have to take the rear cover off to see it.

 

Front cover welch plug P/N 9427693
Rear cover barbell plug (includes -156 oring) P/N 12573460

Your picture above is where the welch plug goes. Here is a picture of where the barbell plug goes, behind the rear cover: