MB/2A Mix n Match

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   First Willys project, and its already becoming a bit of a head scratcher.  My grandparents bought the Jeep back in '82 and gifted it to me earlier this summer.  Lots of childhood memories in this thing, so I figured it was worth having it shipped out to me in Oregon.  After much ado, the Jeep arrived this past weekend. 

The thing runs well (good compression at 105 PSI across the board), so I suppose my main objective is to replace the worn out bits, make some minor cosmetic fixes, and turn it into an around town weekend vehicle.  Maybe the occasional trips to the trailhead.  

Initially I thought I had a CJ2A, with the body and frame in decent condition.  I knew from photos that the suspension bushings and shackles were in rough shape so I ordered a suspension overhaul kit (springs, bushings, shackles, shocks) for  from Kaiser Willys.  

The suspension kit arrived, so I stick my head under the jeep to see what sort of job I have in front of me (should have done this BEFORE ordering anything!).  To my surprise, the  frame appears to have some unexpected "features".  The rear strut frame attachments appear to be relocated to a non-factory location.  As I look a little closer, I also notice this hunk of metal on a rear cross-member:

From what I've gathered, that seemingly unused bracket is in fact a gun turret mount?  Which implies that my chassis is an MB and not a CJ2A?  The drivers side body mounts are also on the inside of the left frame rail.  Given the windshield, side gas filler, tail gate, and grill all appear to match the 2A style, I'm left to believe that someone in the distant past combined these two.  

Trying to sort things out, I went in search of serial numbers.  The only one I could find was on the inside of the left front frame rail under 5 coats of paint:

Pardon the farmers' weld job.  Not sure why the lopped off the bumper gussets.  

The engine appears to be a chain drive version (horizontal and vertical rib on the timing cover).  I couldn't locate a serial number under/behind the oil canister, but I did find a short number stamped just above the water pump:

I guess my plan is to patch and repair as needed to get it up to a reliable level of operation (and stem all the oil leaks down to a slow trickle).  I'd like to maintain a somewhat original appearance, but don't making improvements or mods where reasonable.  Open to suggestions.

What's the difference between CJ2A and MB leaf springs and shackles?  I note that the rear shock mounts locations (and lengths) are different?  Any other reasons why I can't put my new CJ2A kit on the MB chassis?