First off, nice car to start with. Second, $80k is ridiculous unless you are shooting for a 95 point show car.
Third, if you are really serious about a father-son thing, I am planning on selling my '68 400 coupe. It is an original Hollywood car, numbers matching... and the best part is that it's all done and ready to go.
It had a complete restoration, completed three years ago. All stock, restored with original or firebird reproduction parts.
I have $45k invested in it, (a lot of my own elbow grease) plus a lot of professional work along the way.
I am looking to sell her in the low $30k's.
I understand that this is your uncle's car and you have that personal link to her, but you could sell her to put $$ towards mine. (or have another one to slowly restore with your son)

If I am out of line about this, just tell me. No disrespect. I just wanted to throw out another option you may not have considered. I am 54 and have owned about 20+ '68 firebirds since 1979. I currently own four of them.