Unbelievable!!
Well theres more to my mysterious car. The side the starter mounts to was broken off! a huge piece of it. my dad wielded it back together but also!,,, my oil pan was wielded together, as if a hole was taken out of it! i have a feeling the dropped the engine and it screwed things up so my engine is very weird! ss.slp.ls1 made a good catch on the starter boss thing, can you get a more detailed pic of that?
Also it looks as if some material of the block that the starter is supposed to bolt it isn't even there. Like it was broken off. That might explain why you don't have a stock starter and stock flywheel...
I agree with 96CapriceMgr that they sent you mismatched parts. That's why you don't order your rotating assembly parts from JEGS...
I'd get that block machined if you want it to last for a long time.
Here's a pic of mine:

Here's your pic:

PS - On second thought, I might just be seeing gasket material covering the hole.
The Best V8 Stories One Small Block at Time
PS - On second thought, I might just be seeing gasket material covering the hole.







