The Rochester monojet on my '69 I6 250 had a bent up throttle and was literally held together with baling wire. I swapped it in for a rebuilt Rochester Monojet from NationalCarburetors.com for about $280 and was totally happy with it. It arrived all clean and primed and looks like it's good for another 50 years.
You would either need the Rochester Monojet M or the MV, depending on whether you have the manual choke or the automatic choke. (I accidentally ordered the wrong one initially because I'm a newbie who knows nothing, and they were nice enough to not charge me any extra shipping or whatnot on getting the right one to me.)
https://nationalcarburetors.com/chev...arburetor_1969