what would a 69 340 be worth if I was to sell?

Trying to figure out what my motor would be worth. Carb to pan. If I was to sell to build a bigger motor. Its 18 years old and never had a problem with it. I just have no Idea what something like this is worth. Never sold a motor before. First major muscle car and never planned on selling it.

Custom built 650 double pumper from John Kyle
CSR aluminum 1" carb spacer
M-1 intake
stock x heads 2.02 - 1.60's
stock distributor with softer springs
stock balancer
30 over and I thought of that when I was typing this out, but never made it to the page. LOL
Inside:
292-509 hyd. purple shaft
trw 10.5 to 1 pistons
balanced
I always bought new parts for it. Push rods, rocker arms and shafts, distributor drive shaft, oil pump and

If I'm leaving anything out let me know or if you have a question.
I haven't raced it in a couple years, but last time I did it ran 12.72 with a 3000 stall ger convertor and hedman headers (restrictors) I think. The car weighed 3200 lbs, 4:10 gear with 29 in tall mt sporstman pro's I always drove the car to the track about 45 mins away.

Thanks for your input.