SPEEDO CABLE FOR 64 DART A903 TRANS

Here is the pics of the new:



And the old one:





Here is a pic I took from the 65 FSM showing the different tire sizes, rear end ratio and what speedo gear is used with each

I’m going to guess that your 205/70 14 is gonna be around the 735 to 775 size and the gear will be dependent on what your actual rear gearing is. Bear in mind that your original tire size was not 14 in but 13 inches.