How much would you spend on it?

You should not ask me that I AM CHEAP!!!!
My rule of thumb in my old age is NEVER buy any car to put $ and time in that I would not still love IF I wanted to sell it and NO ONE wanted to buy it!!! and I have always been in the mindset of my hobbies should not ever be upside down. Hard to do.
That said, not everyone wants a four door or a big car/
Canutes love C bodies. (But too cheap to pay postage) ha... JOKE!!!!
Hard to buy any complete car for less than $1500 unless a rusted out POS.
Any car that runs and drives has a value. And hard to sell those that don't!''

I have always loved the look of the 65 C body.

I would buy the OPs above mentioned car and just get it running and driving SAFE, and call it good. OK so maybe knock, beat, pull, cut that dent out.