Randys has 4:10 gears for it (lowest available) & good spiders (a weak point) but as said it'd be money wasted. I would locate an A body 8&3/4 which'd be SBP (& $$$) or a truck/E body 8&3/4 which'd be reasonable (& BBP) & have Moser shorten the housing/axles

live every 24 hour block of time like it's your last day on earth