73 Duster petty blue

I am learning that the FABO market on these cars is a lot different from what I have done. Last year I built a 71 duster that was an original /6 auto car. I put a 318 in it, painted it white, restored the interior in black (bench seat), and matte black stripe kit. Car ran and drove great. it looked great. I sold it for $10k at a car show up in wisconsin. I understand that a 73 is not worth as much, but I think I can get at least $7500 for a nice driver car. You can't build a nice car for less than that.