[ArtJ]

The point is that there is only about 2 inches underneath the carb main passage and the oil pan bottom

Anytime the carb must be flushed all the gas goes underneath the oil pan
there is no room for a catch pan, For routine drains I use nearly a roll of
paper towels to soap it up. When the passage needs to be flushed
rather than drained potentially a couple of pints could be sloshing
around dangerously. If you needed a emergency flush - which I did
underway recently it is outright dangerous to have all that gas flowing
around inaccessible !! You may not need this , but others do.

I have a racor separator and a quality in line filter