Just to add a bit to the advise, the Haynes set up is simple with upper and lower wishbone mounting points on a subframe that is incorporated in the final full chassis.
I am looking at taking the specs from the book to convert my Sierra backend Robin Hood to wishbones.
The Sierra diff comes in two LSD ratios, 3.6 and 3.9, Sierra diffs also have ratios from 3.14 to 4.7, you can use any crown wheel and pinion on a LSD diff internals, the Sierra LSD is viscous and may be a bit soft for racing, there are plate diffs and ATB's available to fit the Sierra case.
A friend of mine has converted a live axle chassis to DeDion, you use the original parallel trailing links to the DeDion tube with a panard rod, the Sierra diff and driveshafts.
The Sierra rear track is a bit wider than a live axle, I think about 4" total
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