I see two Rochester 2 barrels on Ebay at the moment #7008388, which is supposed to fit a 265 V8, 1955-57. Here's a specification sheet:

https://www.carburetion.com/CarbNumber.asp?Number=7008388

The 3 bolt carbs are probably Holley or Stromberg models for a Ford flathead engine. The Stromberg I'm talking about has a 4 bolt footprint similar to the Rochester- - - -used on 270 cubic inch MOPAR V8s from the mid-1950s. I'll be using one of them on my 270 GMC when I switch to a military 2 barrel intake manifold for a 302 six. The 2 to 4 barrel adapter for your manifold is available from several online vendors.

For instance:
www.ebay.com/itm/175805818824?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!