slipped gear

i just came across an orange 71 road runner that has been sitting in a garage for the last 40 years. The woman told me it was her husbands, he drove it in there and never moved again. it has a 440.she didn't know what the 6 pack meant when i asked if it had it. My question is? What is a fair price to offer. Not sure if know if motor is seized but imagine it will need a lot of restoration.This could be the beginning of a beautiful relationship or am i damning myself to years of regret. Would appreciate any help. Thanks to any who reply

Iowan

It's only worth what you will stand to pay for it.