I sure miss my 76 - it was a "gotta make room" sale, but wish I'd found a way to keep it. K20 Silverado Camper Special with Special Paint (just orange top over white, nothing fancy) - something I was holding onto for a future project. Oh well.. They are becoming pretty hard to find in decent condition (at a fair price). I prefer 73-74 in the square years, but anything thru 79 works for me.. I've still got my lowback 74 buckets waiting for a home. Someday
Since we're talkin square headlights.. They were standard on the Silverado trim level in '80, but you could also get them on a lower trim level by selecting RPO V22, which got you the bright grille with square headlights. I'm a round-eyed truck sorta guy myself though.