That is a nice looking 73 vert. If there is no rust, and the car has straight panels and undercarriage, I suspect you will be taking that one home. Not listed on the Marti Report is something those 73 verts came with as an included option - Power Disc Brakes. You will have them. I am also pretty sure you will have the deluxe inner door panels. Neither are mentioned on our Marti Report (Elite version), but our vert has both, I read elsewhere the verts included PDB, but I never saw anything about the inner door panels being deluxe on the verts. You can always hope.
One option missing is the factory A/C, but that is not a big deal, especially on a convertible. We have both a 73 Mach 1 and a 73 vert, and neither had factory A/C. The Mach 1 definitely needed A/C, but the vert was fine without one. But, after putting A/C into the Mach 1 we decided to do the vert also. We got our A/C kits from Classic Air. The Vintage Air kits seem pretty good also, based on what I have read from others. But, the shop that installed the kits for us advised they prefer working with Classic Air kits. We are very happy with the Classic A/C systems.
Being a non A/C car, our vert came with the bottom of the capacity 42 or 43 amp alternator. It was sufficient on the vert in its factory setup. But, we added A/C, dual electric cooling fans, a headlight relay that turns the headlights on any time the engine is running, a full length center console with a power panel used to charge iPhones and iPads, a WebCam, and an LED taillight kit. The LED taillights did not add more electrical demand on the alternator, but the other items did. I took the alternator to a local alternator and starter specialty shop, and had it rebuilt using a rotor with added windings. The alternator now puts out 65+ amps, plenty enough to keep up with the additional electrical load with the options we installed. It was well worth the rebuild.
Finding a First Generation Mustang with such low original miles is awesome. Ours was literally barn stored over 40 years when a prior owner became too ill to drive it. When we purchased it the odometer shows under 20,000 miles on it. Now it has just over 21,000 original miles. Ours was not restored, other than new tires and a new convertible top. Everything else is just as it was from the factory (plus added a front spoiler just to give the car more visual edge). The only downside you may find is the very steep 2.75:1 rear axle ratio may cause the Mustang to feel a little sluggish at low speeds. Your 351 may help with that, I can tell the rear is (also) geared quite high on our vert - and our 302 2v does a nice job, but we definitely have a low end performance degradation due to the rear axle gearing. It is not worth replacing the gears with a lower ratio gear set, as the verts were never intended to be high performance vehicles to begin with. That said, even with the steep rear axle ratio gear set the vert is a very fun car to drive, and plenty perky. If it is speed I feel the need for we have a 73 Mach 1 that is built for street/strip performance, a 1969 Shelby GT500, and a 2020 Shelby GT500 I can always turn to for a fun romp somewhere safe. We find the vert to be a very refined vehicle that is a blast to cut around in.
