I've ran YF model Carter carbs on the 235 I used to have & now on my inline 292 Chevy. They use the same jets as AFB models so are readily available. Also have about twice the screws connecting the mid & top sections so's they don't leak gas out like the old Rochesters. Tuning is another story, but given a good distance highway run repeated enough, you can closely document fuel useage. No matter what it came on or how it WAS set up, you can make it right for your application. Putting in an O2 sensor is a good help for tuning too.
Nice looking truck, like your pics.
Doug
