the road runner had an available décor package ...(code A87, I believe) which included the bright tail panel and the plastic chrome arm rest bases and usually a nicer door mirror and deluxe steering wheel.
Incorrect. In 1968, the code would be three numeric digits.
Sales Code 360 = "Road Runner Decor Group" - Includes, color keyed carpets with auto trans only, vinyl trim, B Pillar Stainless Steel cover, bright arm rest base, rear arm rests with ash trays, bright trim panel rear moldings, partial horn ring, painted deck lid panel with Road Runner Decal.
In my opinion, that's a nice car you have there. Is it a Road Runner? Probably not. How did you buy it without a VIN? I mean no disrespect, but you really need to lose that black stripe on the deck lid!