Probably the rarest of the years for GT. Most a paint and decal package. Notice the Grand Prix/AM dash which was a Grand LeMans standard in 76/77 optional for GT with the Custom Sport Wheel. 350 4bbl was top engine choice in 77 but he does not say what this has. Other engines that found their way into Canadian LeMans were 250 L6, 305 V8 and 350 2bbl & 4bbl. All Chevrolet.

I can't see how you can go wrong for $600, the CS wheel is a regularily a $200 item on ebay.