i did it! i got my old 350 out and my 5.3 in.. and i used the dirty dingo sliders like you said and it was so easy! did it in one afternoon with my wife! thanks for posting and showing us whats up on this swap. i deleted my emissions along with the vats.. sent to brendan @
http://www.lt1swap.com/ followed his instructions on the harness mods. building the fuse block featured on his site. also took the advise on the boyd welding tank, went with the efi model. and picked up some doug thorley swap headers! still got some work to do on it.. should be done soon, weather permitting. heres a pic and thanks for the inspiration!