Need Speedo gear for my 64 dart

trapster said
Just standard 14" 215/60r14

OK according to the 65 FSM for an 833 with 14 inch tires:

Tire Size Gear
7.35-14 18 - Dk Purple **
7.75-14 18 - Dk Purple **
8.25-14 21 - Gray

** Use .8000:1 Ratio Adapter #2464420

Looks like your best best is to use the ratio adapter