Idle: .67f/1.20 air/ jet holder. emulsion tubes: F7. mains: 137/160
chokes: 42mm. Pump jets 1.0
You need to make the .67 idle from a .65 and drill it out. The same with the main fuel. You use a 135 and drill it to 137.
It will also lean out with altitude like for Colorado but I don't know what you can do there. A Pike's Peak Hill climb is an issue.
Think of the Webers as an analog system that can only be modified by human interaction and the EFI system as a digital "self learning" system in the sense that it adjusts it's fuel delivery pattern according to predetermined criteria programed into a script but because it is digital can make very small incremental changes instantaneously as the engine is running.
It aims at pre-determined optimal A/F ratios according to rpm, velocity, air temperature and engine load.
The EFI has limitations and will vary the maximum power available according to the limitation of the atmospheric conditions but it will come closer to optimal.
Think of the air/fuel proportion like making tomato soup. You are aiming at one consistency. If the engine needs tomato sauce, if it is too thin, it is tomato juice and is to weak to make power and if it is too thick it is tomato paste and too thick to make power.
A 125 fuel main is feeding the engine tomato sauce with a teaspoon and a 175 main is feeding it with a ladle.
The other engines use different "consistencies" then the Cleveland needs.
The 289s like tomato juice. The 427s like tomato paste.
The 150 fuel mains mentioned was something that Reggie Jackson mentioned years ago about his small block Chevy engine running Webers. Even though there are similarities in cubic inch displacements, there the "consistency" changes. The Chevy likes Tomato Juice, maybe even "V8 Juice"? The Cleveland will get agita from that.
Incidentally, I tried to deal with Kleinpeter back then also. I don't remember exactly the year but it was in the '76-78 time frame.
Since I was just beginning my Pantera experiences, I found him to be a "SuperFlake" and didn't need "the only Weber set up in North America" nor even his "flip top" race car, which was also for sale then.
I discovered Gary Hall and Hall Pantera and Gary had just cast up his intake manifold and was very helpful at any time. So we were at least "simpatico" whereas Kleinpeter and I were just ying and yang.