65 Dart with PPP Shifter Rear Exit cable?

Please, i can use some help here.
i need to know the correct shifter cable lenght for a 65/904 small block…i really like the PPP Shifter, and it looks like its the best and easy way to go with a sb with TTI headers.
shifter is a rear exit cable with Trasmission rear cable entry? pictures will help alot…
thanks: Gilbert.