Help with Ford 200 Engine code

There is a ford 200 for sale and I don't know if it is the seven bearing block. It has the 5 freeze plugs but the stamp on the block is C6DE 6015-B

Any ideas? Also will the transmission bolted to my 144 bolt right up to this block? It is the "crash box" transmission.

And the 200 came out of a 66 mustang.

If it has five freeze plugs it's a seven main block. That's what the freeze plugs holes are for. To clean out the sand between the main webs. 65 blocks just had the small bolt pattern. 66 should have both bolt patterns. The 144 bell uses the small pattern so it will work with either block. The 200 likes the bigger clutch but it will work with the small clutch. You should be good to go.

Duane in Tennessee.

Thanks for the help that's exactly what I wanted to hear