New rear end, stock driveshaft???

I have an 8" rear right now. And it's a 9" Currie that I ordered. So the yoke's probably different.

And that's the bad thing, the 1 junkyard in my town has crap for Mustangs. I think they have a couple 65 or 66s. They do have a few Cougars though, not sure on the years of them.

So does anyone know for sure what I'm gonna have to do here?

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'69 Coupe with 351W
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Edelbrock RPM intake, Edelbrock RPM cam, Edelbrock 750 cfm carb, Edelbrock lifters, Edelbrock double roller timing chain, Edelbrock valve springs, Accel coil, Moroso Blue-Max wires, Hedman headers, 2 1/2" pipe, glasspacks, Flex fan, Lakewood traction bars, C4, 9" Currie on order, 290hp-stock heads
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The Surgeon General didn't say anything about smoking your azz!!