The previous statement "basically you said the 9635sa was not a good one" caught my eye.
Not trying to steal thunder from one of Jon's older forum messages, I recall:
The 9635sa is a CLONE of the great originally Carter-made 9635s.
They are not the same carburetor.
This also appiles to the 9636sa and 9637sa (Chrysler and Ford respectively).
Carter went out business around 1985 and so began the clones.
In searching for member experiences of the Carter YF (my own curiosity) in other forums and I couldn't help but notice statements that are common with the Stovebolt forum and this discussion. Mainly the Ford Six (240 and 300) and Jeep Six (258) forums. Repeating words like "torque engines", low VE at higher RPMs (compared to V8) and members/owners tending to overcarburate. Please don't shoot the messenger. Sound familiar?
Now back to 1985 when fuel injection started taking business away from the carburetor companies, the dog-eat-dog competition amongst the remaining companies lead to the "Marketing Department". Their goal is to create specifications that snag the average buyer. Fuel injection is superior so why waste money on a "Design Engineering Department" to improve the function of the carburetor. Just clone what was made in the past and find ways to improve manufacturing ROI (make more profit with less cost). The last four sentences are my words but is it not typical of the history of busniesses in the USA?
So the new carburetors made today, regrdless of name branding, are designed with a "vortex" for our dollars (credit card)? Choose carefully.