Depends on what your vision is. 10k can be a lot or it can be just the start. I have 7k into my motor alone, including, carbs, manifold, radiator, plugs, wires, machining, internals, etc.
#1 rule, the price is set by what you think the item is worth, not by what is being asked.
You have to decide if that rusted out hoopty is worth 10k to you. It might not be to anyone else, but you are not anyone else.
I know where a couple of nice rides are, two that run, one that doesn't.
1950 Chevy coupe, non-running but complete, $3500
1953 Chevy 210, runs and is complete, $2900
1947 Chevy 5 window truck runs but needs to be redone, $1500 or so.
I plan to buy them all but won't pay quite that much so I haven't purchased any of them yet. I would give $2k for the coupe, $1800 for the 210 and $1000 for the 5 window.
This is what they are worth to me, the owners think differently. I am waiting them out until my current builds are complete sometime this year.