Found this gem of a post over on reddit by user JRZ126. He swapped an LS motor into his 1986 Monte Carlo SS.
Read more: Monte Carlo SS – 383 SBC to LS SwapNotes:
Donor Vehicle – 2002 Yukon w/ 6.0 LQ4 and 4l60E
Cam – LS6 cam from Z06 Vette
Headers – F-Body
Oil Pan – GM Muscle Car Oil Pan
Intake – LS6
Tank – EFI Gas Tank