What part of part number "7008388 Rochester 2 barrel" is hard to understand? That specific carb is calibrated for a 265- - - -close to the size engine you have, and it's got the small diameter venturis for good part throttle response. That generic "one size fits none" carb on Ebay is worse than the one you've got already.
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!