Crower Small Block Chevy magnesium fuel injection manifold

I acquired this in a trade and it's a perfect non molested manifold. No porting or welding. I really do not know what it's worth, so I had to put a price. I have looked around and these things are rare. I'm going to take the best offer. I would consider trades. I am looking for Big Block Corvette intake manifolds specifically a tri-power. I also am looking for a transmission 5 speed or 6 speed.