OK....this is where it would be nice if Randy's NASCAR model forum was still here.
By 72 NASCAR did not require STOCK suspension on Cup cars but the wording was 'Stock type'. So if showroom car had coils up front and coils out back with trailing arms a 72 Torino could use GM truck trailing arms and many did. BUT Bobby Allison build his Monme Carlos in his shop and he used stock location trail arms (short) So the basic rule is 'Stock Type' but location points and manufacture was FREE.