Hi,
I just got in after removing the rear main on my 4.0.
Here's what's stressing me out right now... The part of the seal that sits in the engine block was stuck, and while carefully hitting it with a punch to break it free, a piece of the casting on the outside of the block fell off. It's a little pizza shaped bit of metal the size of my pinky toenail.
How bad is that? Can I still use the block?

http://i1380.photobucket.com/albums/ah179/Runar_Borgli/IMG_20180814_001220_zpsmlshgy45.jpg


I don't know what the last guy used when he put the seal in. When I finally got a piece of it sticking out, I had to grip it with a pair of pliers and put a foot up on the engine to yank it out

 

pics would help

 

There's a link

 

Here's the pic the OP was trying to post.

 

if I was building a engine from scratch I would locate another block

 

or have it welded up and machined back out