Quote:

The IR throttles have to be really huge to beat a carbureted plenum manifold.



This kind of formed my opinion........they seem to start at 2 1/8" dia and go up from there on small block set ups I have seen........telling me that they will allow huge amounts of air in.
And if you don't have the arrangement that requires this , a carb would be a better choice.
Again.....purely guess work from my corner.
But it seems to work on paper.