68 valaint driveshaft question

is there a stock driveshaft i can get that will work on a 68 valaint 2 door with a 360 / 727 trans and a 8 3/4 suregrip rear end?

i dont have a driveshaft for my project and its getting about time for me to find one.

does anyone know where i can get one for somewhat cheap?

if there isnt a stock then any ideas on one that would work or would i just have to get a custom one made?

thanks