I just did a search at
http://www.napaonline and came up with a tad bit of info. you can buy the speede cable wire by the foot in .130 and .150 od.
I measured my 76 speedo cable and its .120 od. I also found atool for swaging ends on cables for $0.49 and cable ends. Does anybody know whitch end might work or a shop I can send my cable to to have it done cheaply. have listed the napa parts as followed. I need to convert mine to hook to a th350 trans!!
speedometer cable staking tool p/n bk 6151801 $.049
speedometer cable wire .130 od p/n bk 6151837 $0.99 ft
speedometer cable wire .150 od p/n bk 6151838 $1.23 ft
cable adapter key length 1-5/16 (.104 square end p/n bk 6151836 $5.49
cable adapter key length 1-5/8 (.203 x .104 square end p/n bk 6151833 $7.49