[MARKDTN]

Not sure what an LS1 Police interceptor or a Texas bed is, but anyway. LS swaps are very popular. That is the direction I would go. The best way is to use it with a 4L60E or 4L80E transmission. With a drive-by-wire LS you will not be able to use a 700R4 because you will have no way to make the TV cable work. Most people get the LS harness from the donor vehicle or you can buy them from several places including Street and Performance, Howell, and others. There is a subsection dedicated to LS swaps, so I would look there. Good luck with your build.