If one is rebuilding a Carter YF designed for either the 216 or the 235, the valves in the picture below are correct.

Two valves are pictured; one assembled, the other unassembled.

[img]https://www.thecarburetorshop.com/Carter_fuel_valve_spring.jpg[/img]

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop