Cost for A Body 8.75 Rear End

There’s a guy local to me that’s asking $650 for an open diff 2.76 with a 741 center case. I hear these a body 8.75 are going for higher cost but $650 with a 741 seems high compared to what I’ve seen some people scoop them up for on here. I would be ditching the center case for a 742 or 489.

I’m steering away from cutting down b and e body housings in fear of warping it and the cost to get it cut down professionally would put me around the 650 range anyway I suppose I’d be in a better position though with a bigger center case

Dropping a b body rear end in a dart sounds extremely limiting on wheel options. I’ve been getting some great feed back on my wanted post in regards of info. Hoping to get some cost estimates here :)