[Mr70]

Same here.
Does it have a Z/28 rear spoiler,band aid stripes or 15" tires?
It could be a factory SS/RS with the small block L-48 350/300HP engine.Aside from the obvious block/vehicle VIN comparisons,check to see if it has the typical SS & engine cid callout on the fenders,along w/an 18" articulated driverside wiper arm-(both arms black chromed),blacked out rear tail panel and 14" tires too.