Effect on value?

Pricing is CrAzY. I have been looking for a second gen Barracuda fastback. Found one local, very solid car in all the right places but needs both front floor pans and the bottoms of both quarters replaced due to lousy repairs. In primer, interior and trim is completely disassembled. All the parts are there. Roller. All new front suspension. 8 3/4 rear and a supposedly fresh 340 on the stand. Non numbers matching. 10 grand. Had my body guy take a look, he said buy it then quoted me 10 grand for the body and paint with me putting it back together. Then there are the unknowns like dash restoration, grill restoration and have you price tail lights for these cars? I am on the fence and considering looking for a finished car.
Is the guy doing your body and paint work competent, can you trust him? You didn't say whose buying paint and materials but regardless ten grand is low price
If the car turns out to be what you hope it is and your body guy can finish it for ten large, id say your getting a good deal but "IF" is a big word...