1957 Ford Fairlane Engine Question

So I need some help figuring out exactly what motor I have and what year it's from.
It came out of a 57 fairlane but want to know if it's original
So here it is I'm thinking it's a 292 because the block casting number is "EDB 6015 ?"
Right after the "5" there is a letter I can't seem to tell what it is.
Also the main caps are stamped "EBU6329-B"
The crank is stamped "EC"
There is also "68J4" stamped on the block and "68J" on the passenger side head
Any help is appreciated
I can't seem to load pics

http://ford-y-block.com/Block%20identification.htm


Ya that's the only web site I have found but I can't seem to figure out what the last casting letter on the block is