Need some help with pricing 78 T/A
 

Good Afternoon guys, trying to gauge pricing on a car I may be selling. I have seen them with super low mileage from 40k-69k. Any help is appreciated.

78 TA, Y88 edition completely original garage find with 3100 original miles.
original owner, original tires
Gold, T-tops, 400, auto trans, PW, AC
Paint is original. Runs great.
only issue is a small bubble at bottom of DS door in paint size smaller then a quarter.

Any help on a realistic price would be appreciated.
also have a 79 Bird with 11K miles but thats another post.

Thanks in advance!!

which 400 does it have? the base or the T/A-6.6