new to forum, have rear end question

Hi,
i just signed up for this site, so please forgive me if this has been covered before. I have a 73 duster, had a slant in it. Just finished swapping to a 318, automatic. I am wondering if there is an economical rear end i can swap in as i have heard the stock one will not survive. I dont want to break the bank. Is there a complete rear axle assembly i can remove from a boneyard car like a fifth avenue or similar that will fit? Any and all advice,links, etc is appreciated. thanks!
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