weird engine manufacture code

[70CitrusZ]

Wow, so its a known code. Thats what my car is..an L36/M20. I wonder why the use of a different code than regularly used for L36/M20?..seems weird to make a code just for the sake of making a code.
Are there any peculiarities to your engine? I only have block, heads and intake and distributor so I still need to round up a carb and exhaust manifolds and smog stuff. also there is no gas tank in my car so I need to find that hard to get tank sender with two pipes.
Mark.