13/51 sprockets and chain length help

So I have decided to run a 13/51 sprocket setup on my wr250r but not real sure on length of chain I should get. Should I get a 114 or 116 link?
Yes I am aware my bike will not be highway worthy anymore.

I've run 13/51 which is just about the same as 12/48. Its good for the gnarly stuff, I use it for enduro-events.

Fwiw, I wouldn't be going with a 12T sprocket, as the front chain slipper might be eaten even faster than usual.

I ran 13-48 up until recently (retired both bike and me from work, and need more travel ability, so now 14-48), and I agree that for some horrible terrain 1st gear isn't low enough.

+1 for the 13-51. Probably should've gone there myself...