U Joint sizes: 71' Duster

I can use either 1310's, 1330's or 1350's... i have to buy a new flange yoke, and I'm looking at them right now...I think I'll go 1330... I guess it is not that expensive to have a shaft made, so I can just go 1330's front and back...

it's a mild 318, so I don't think I really need the 1350's...