Question about carbs for tunnel rams

One could argue it looks strange either way.
Not trying to be a jerk, just trying to understand what's going on here.

The rear of the tr should be higher, because the engine is higher in the front, however the top of the tr should be flat across both mounting pads.

With the carbs off I can put a straight edge across the tr and it is flat.

Can anyone chime in as to why the small block tr has mounting pads at different heights, but instead of angled they are level to each other?