Y-block ID question

The '62 F100 I recently picked up has a nice running Y-block in it. I initially ***umed it was original to the truck since the VIN identifies it as a 292 truck originally. However, in the past few weeks since I have been tinkering with it I have discovered that it in fact does not have the original engine or transmission in it. The transmission is a 3.03 top loader - most likely from a Y-block p***enger car (because it has a slip yoke and the large input shaft) and the block casting number is B9AE - which is either a 292 OR a 312. When I made that discovery I was quick to examine the crankshaft flange since I happened to have the transmission out for some clutch and flywheel service. Looking at the crank flange it appears to be a 3.10" stroke crank from a 239....so now I am really confused. The flange has one crescent and no flat - indicating a 3.10" stroke from all the literature I can find so far. I have also noticed lots of conflicting information about Y-block stuff in general so I'm wondering what the chances are that its actually not a 239 crank.

Can a 239 crank be installed in a 292/312 without using special pistons to correct the compression height? If it can then I can see where it might possibly be a *******ized engine someone made....but if it would require custom pistons to make it work then I would be doubtful. The engine runs great and seems to have plenty of power - not a powerhouse - but certainly not a dog either.

Here's a pic of the crank flange:

 

Just now poking around here on the HAMB and I have actually found a few instances of members claiming to have a crank that looks exactly like this one (flange end) that is actually a 312 crank. Supposedly there were a few around that didn't have the flat with the dot. Anyone else heard of this before?

 

The only way to be sure it's a 312 is to pull the oil pan & look for ECZ stamped on the main caps.
To decipher yblock numbers go to John Mummerts www.ford-y-block.com
He also has plenty of goodies for them.
Another site for more good information go to www.yblocksforever.com
Plenty of knowledgable old guys there.

 

Yeah I reckon. I may never know for sure...the engine is very clean, runs great and doesn't leak any oil. I'm not going to disturb the ***embly.

 

Does the engine have a breather on the front left corner of the block? If is cast over it's a late 292.

 

No, its a 59-60 block.

 

If it was a truck block it would be an AT cast in it. In 1962 ford started using AE blocks in cars and trucks, the only difference was the heads.