I will be working on my truck this next week, and have a fresh rebuilt Zenith 228 (model 11963) ready to install. My question is what do I need to look for or adjust on the zenith carburetor once I have it installed. I’m having a little bit of trouble finding how to tune this carburetor for my stock configured 261 engine. I do not have the carburetor with me at the moment, but I am not certain that it has the adjustable jet either. Any guidance?