I knew I should have took a picture, before asking. I reversed the numbers in my head, before I got it posted.
Here is the picture. It's AE 6394-E, with what I believe is a casting date of 49.
I thought maybe it was a 226 H, 6 cyl but, the picture I could find of that engine, doesn't look much like it.
This bell only has four, 7/16 mounting bolts. Your Y block pic has a lot more. I have my '54 223, in the car but, it doesn't look like that either and that 49 casting date, would rule out OHV engines?