That's a beautiful car. Probably one of the best restorations in the country. Love the correct seat belts and the color combo. Noticed the front disc upgrade and the 8.2 10 bolt rear. My guess is $22-25K.
I wouldn't take any less than $25K. Anyone who's been through a convertible restoration or something even close knows the cost. The trim and chrome alone will be a killer. The initial cost of a decent restoration candidate can't be ignored, and with a lot of paint and body estimates north of 10K, buy this one done instead.