Hey YR, yes it is the 1.60 Venturi. Curious question... What is the benefit of 1.1 on the secondary versus conventional progressive? Here is the spec sheet.
I'm still trying to understand the square jetting without a power valve in the secondary side.
I used 1:1 linkage because with a 4.56 gear it made it so I wasn't so far into the throttle at a cruise. But I had to square jet it and run a power valve in both sides to do it.
I should have written all that crap down at the time. I remember that I could run fairly small main jets and cover it up with the power valve. That was 1985 so I'm taxing my memory on IFR, IAB, PVCR, HSAB etc. I should have written it down.