Talk me out of a part out???

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So I am not going to lie, I bought this 89 coupe a couple weeks ago because I love the looks and suspension of notch backs. I have a LS1 T56 that I took out of my 00 SS Camaro that I have been planning on putting into it. The car had drove off into a culvert on the drivers front but is very repairable. Everything is in front of the strut tower. This is a completely virgin car exept for flowmasters have been installed. When I took the fender and bumper cover off I seen the buck tag and it sayes GOVT above Special Service Package and knew the 160 speedo seemed weird so I started check stuff out. My car is blue on blue with a 5.0 AOD. Interior is very clean, and exterior needs paint and the front repaired. What is up with this car, people are freaking out about what I am about to do to this car.