The 32/36 is a 300+ CFM carburetor. I know very little about carburetors but I'd guess that 300 CFM would match up better with a 235 than would dual 32/36 at 2x300 CFM.

The dual Carter-Webers sold by Langdon (at a good price) match up nicely with a 235 (but are too small for a 261).