My situation:
I picked up a 71 block, heads, crank, V/C's, intake, and carbs. Basically a complete non running set up without exhaust for 5K. Then I spent about 3K on various outside parts that were missing. After that, it was sent out for rebuild. I've got another 3.5 to 4K into that so far because of the stroker set up it's getting plus all the parts to do the re build. I still haven't done any major D/P yet for machine work or Dyno run for afterwards.
So add that in whatever that will come to.
Up to 20K yeah, I can see that easily now to build one.