I guess it would matter if it is a drive train numbers matching car. The engine is the heart of it all. If that is not original born with to the car, than it would begin to be OK for the paint to be incorrect. Then the trans and rear axle follow close behind. If it all is verified, inspected as a numbers matching REAL Z/28... THEN that would NOT be good. A complete paint job or even a correction of the hood/cowl/deck lid etc., would be thousands of dollars. Lots more to consider like the asking price, and how bad you want it, or if you even CARE if it's all original. Then you have components. They can be costly if missing. The dist., carb, generator, smog, manifolds both intake and exhaust, water pump, clutch & Fan IF missing, can add up to a quick TEN THOUSAND DOLLARS! If I was you, I would post pictures here, of all the numbers you can find on the engine, trans and rear axle. Better make sure it's the real deal FIRST. If not, buy it and most of all have fun with it. Danny