Hot Rods Dual carbs for 323.5 Chrysler S8?

I noticed while researching parts for Dads (R.I.P. ) C49 S8 323.5 SpitFire that there were a few pictured with dual aftermarket carb setups.
Anyone know the brand(s)?
I know I will be rebuilding the 1bbl on it anyway so just curious (looked much better anyway).
Picture is of my single carb stock set-up with I guess (Dad isn’t around to ask) an optional(?) chrome package.

Thanks

 

Pic of a 6 banger dual carb setup