It really does look like an LL3 with a uprated crank, comparing the porting to the LL3 thread it's very close, though the LL3 has more of a tear drop design on the side ports.
As much as I love the price point of this engine, and the LL3 (though the Max looks a fair bit better), I'm not sure about that idle screw design and placement, it seems to restrict the carbs ability to rotate, not a problem in some cars, but I noticed with my new MTX5 is needs the carb rotated in the direction that seems restricted on the LL3/RP3.5.
