Just got Engine back from Machine Shop. Engine Block#'s (3858174) (GM225) (F1123YD)
Head# (3782461) (B175)
Friend researched and says that this engine was meant for a CHEVELLE,MONTE CARLO OR EL CAMINO but the YD at the end of the code indicates Pick Up. The Block Casting # says car only but the stamped #.... that was applied well after the Block was cast indicates that it was installed in a Pick Up. He thinks it is indeed a Hybrid Engine. Will continue to research.
https://www.amazon.com/photos/share/...HnbcINHHDavtM4