value of parts

trying to buy some parts from this guy, and dont know fair price to offer him, for him and me, maybe you guys could give me a price to go by ? thanks 340 motors 1968-1972 complete manifold to pan ? sb hp manifolds ? 83/4 pigs [center sections] posie ? fresh 360 short block ? 4 speed trans a body ? 1964 valient convertible 273 drive train needs some cosmetic work, seat need redone, ,new top ,brakes ,misc doees run, with title, thanks for any help


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