4,6 short block. need input on salvage cost

[Ares]

What Im looking to try and build is a good solid short block. Anyone have an idea on what a Cobra block without heads or any other items may go for. same with the iron 4.6 block and possibly a 5.4 block with crank. Im thinking of just building a very strong bottom end or even a stroked 4.6 motor. I would rather use aluminum cobra block.

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2000 GT Laser red-5speed
MAC Cold-air Induction
MAC 2 1/2" cat back exhuast
275/50-15 Drag T/A's used at track
Best Quarter mile run to date: 13.50@99.97 (1.87 60')