The Jetfire is not really able to be compared to anything other than a Cutlass or f-85 of the same year. For the most part you have to fabricate any needed body panels or cut them from another car. The Jetfire is for sure a unique car and lots of fun but if it needs major restoration and missing the turbo parts you can’t pay much for it. From your description of the car it is only worth $1000 to $2500 in my opinion. Maybe less with all the 4 speed stuff is missing.