I'm running a Zenith 228 11963 on my 261, pretty good results. My 261 is bored .060 to 269ci; found the carb on an old GMC 270. Lots of power and acceleration. Only compliant (not even sure this is carb releated) is a very very slight hesitation upon hitting the gas pedal at low RPMs. Doesn't affect drivability at all.
One thing to note - you'll need a model 175 base for the 261 engine. Bolt hole space is wider than a 174 base, which will fit a 235. Those are very hard to find.
My thought - if your current carb performs near perfect, why mess with it? The difference in performance you'd realize on your stock truck wouldn't be worth it - it's still a slow old truck.
Last edited by Green_98; 11/19/2021 12:57 AM.
