Not sure what you mean,but if you are referring to the carb being buried in the cowl behind the engine and air intake to it,its not a problem IME.
Keep in mind many of our most powerful designed for purpose engines (ex,,,ZDZ,3W,DA) are set up the same way.A "cold" air intake is easy to arrange....if its needed.
I just put a tape on a Ryobi in my shop and it measures 6.5" from the rear of the carb to the front of the prop driver,with a Bisson muffler in place,with the B&B mount adding maybe 1/4" more.. For comparison A 38 cc Quadra 400,(which uses a side mount carb and muffler) in my 1/3 Spacewalker with a bell mount measures exactly the same at 6.5".