72 sub w/ 700R4 speedo cable p/n?

[98L150]

I just put a new 350 crate motor and 700R4 in y 72 sub. I have seen some threads regarding what to do about the speedometer cable having to be replaced with a longer one, like I need to do. Does any one know a speedometer cable p/n to use or what year model vehicle to ask for the speedometer cable out of? This seem to be the easiest way to get parts at an auto parts store now days.


Jeff