One very good sign is the headlight doors and the fasten seat belt light is working on the dash - an indication the electrical system is original and intact. The vinyl seat covering material and carpet are in very good condition with sun fade - on the hard plastic of the glove compartment and carpet.
As for options, I would in person confirm all the power seats, windows, A/C are working. My 69 was a rust free CA car, and I took the buyers statement that items "worked" but all the electrical contacts - switches had mild corrosion issues that I have been cleaning - addressing.
This car also has a rim blow steering wheel, you will have to check that as well.
The some of the components in the Motorola radio's of this era are no long available. It may not be possible to re-built, but require the digital upgrade for $600. My radio worked for a year then the old components broke down. (this is what I was told calling around to several shops noted on this site).
It appears the paint on the rear end of the body from the front doors back is a slightly different shade of than the front of the car. The vinyl top appears to be good - not corroded at the edges. Personally I like the 4 door hardtops, but we all know the big money is with the two doors.
Look on line, 1970 300's, that are solid, all together there, rust "free" and has been activly maintaned and driven, they appear to be selling for $14 to $16K.
From the licence plate in the trunk, it looks like it was last registered in May 1990. To be a dependable driver, working with this as a solid base, you will need $5,000 + in new parts to replace the old degraded ones (tires, brake lines, shocks, front end rubber bushings - ball joints, fuel lines, u-joints, ect) plus a few bucks to install a new headliner. With that being said, $9,500 to $10,00 - knowing that it will take some $$$ to get it to the $14K price. If the paint does not match, then I would knock a few more dollars off as it will take money to correct.
Hopefully this help with the decision and context from a second set of eyes. Good luck.