Oh boy. Well, I'm assuming you mean a solid core of carbs. Which would be IMO worth around $150. That's just a core. HOWEVER, it has to be a GOOD core. Meaning, I have pictures of inside the bowls, the OEM brass all still exists, and no one has "tried" to rebuild them already which usually translates to damage or parts that need to be replaced. No damage from improper removal/install on any intakes. No gouges from screwdrivers on the slides where someone tried to unstick them. I could go on but I digress.
Problem is that most people can't discriminate/assess a carb rack or what is wrong with it.
$35 definitely sounds like the person assigning the value has basically assessed it as "parts rack."