Can you help me identify my B&S?

I have a Cub Cadet RZT50 I just purchased from a local guy.  The engine on it is definitely not stock, but I can't seem to identify what's actually on there.  Model number for my CC is 17BA5A7P712.  I think it should be a 22 HP B&S V-Twin Intek.  But.... Nothing was put together "properly" and what was installed onto the engine just doesn't fit right.  When I went to buy the blower housing by the "proper" part number, the fan that fits over the flywheel was ever so slightly smaller in diameter than the flange it sat on.  It was close enough that I could pound it down and screw it in.  The outer housing, though, doesn't quite fit over the intake elbow properly.
 
The fuel pump is hanging off the right hand side, but the mounting bracket is missing.  It has a cylindrical exhaust that sticks out the back rather than the stainless one that goes through the deck.  
 
It all works just fine, but I would really like to fix it up to where it has the proper housings, brackets and eventually exhaust if I can get one that goes through the deck.  That part is not as important.
 
Anyway, I can't find a part number/part code anywhere on the block.  What are some photos that I can upload here that can perhaps help anyone here to identify the engine I have?
 
Thanks in advance!

Thank you.  I've seen that.  I believe that all traditional sources of any sort of data plate/stamp have been modded off.

Ok.  Here are some pics.  Note that it's the blower assy & cover that are def wrong.  I can't find the right one to fit this motor.
Mostly, I would like to find the right blower assy & cover, fuel pump bracket and air filter so everything buttons up nicely.
Interestingly, the breather tube seems to have a double wall on the engine side that slides around the nipple.  I'm trying to replace it, but can't find the right one (see last image).  I bought one that was the right shape and length, but didn't attach to the nipple properly.