Good luck, I think at $30 and you should be ok.
We bought a 77 targa w/ fresh engine rebuild but rest had been sitting for some time. Took about $50k to address all of the mechanical issues, there were lots, but no rust. Interior took another $30k to refresh. We didn’t do any of the work but had to spend ~40k in parts and plating.
so we are $130k in on a car that is worth $80k at best, but she is a toy that is incredible to drive!