Average parts car value

I look at what I could sell the parts for (or what they are worth to me) and then the scrap value of the rest (~140/ton here). I sold a 75 Dart roller in pretty rough shape, no windshield or engine/trans for 1K. It did have weld wheels all the way around, narrowed 8 3/4 (open diff 3.23) and front BBP disks. The buyer asked if I would go lower, I told him I figured 1K just for the front disc setup, rear end, and wheels so the body went for free. He was happy with that and paid me to deliver it (was still on my trailer)