I tried an adapter with a two barrel,not worth the effort.But I did open up the top of a stock intake,make a phenolic mounting flange and bolt on a Holley 2300 from a 266 IHC V-8 engine,just slightly smaller than a typical 350 cfm Holley. Major impovement on a 261,way better throttle response,better pull at all speeds and even the gas mileage is better.I believe the 2300 series Holley is a better choice than the Weber Holley butt ugly Pinto carbs.But this ain't exactly on a bolt on.
The Holley 1904 one barrel from a 225 slant six Mopar is a great improvement also.A bolt on,but the throttle linkage and choke needs some backyard engineering.Some 50's GMC 270's had a Holley 1904,should work as is on a Chevy
