Briggs build I have I made an adapter to set float bowl level where I used an elbow bend to clear the frame. 15 degrees is what I read Briggs allowed for oil splash lube and maybe carb too.
I think the throttle cable is now having a situation where it interferes with the frame you say. Heating beside having to remove all gas and oil for safety is one thing, but changing the metal an softening it you don't want. I mean the way they specially quench metal to achive hardness. Not sure with but Briggs carb where I had to make my own adapter when engine is no longer on a lawn edger, I designed my own.
Maybe throttle cable could be adapted, but others with China MB engines would best know that.
I did notch out an area to clear a belt and sheave on rear wheel drive, but I welded additional metal overkill metal to compensate.
A nice wide radius bend is best for ease of cable movement on the throttle. If it binds best be sure an engine kill switch is working. I have both a button and a toggle switch as a back up incase. Throttle really has to move freely to be safe.
MT