rear end choices?

Hello,

So i'm wondering what rear end would be best for my 74 dart. I currently have an 8 1/4 that im sure wont last behind a 383/833. would a 8.8 hold up? The 383 is stock currently but am planning a 451 after i have the car up and running. 8 3/4's are almost impossible to find and expensive when you find them around here. Any other options out there?

Ryan