Do you remember the GM Ram Jet crate engines? They were before the LS in the Vortec platform. Both small and big block EFI in several different power levels each and included the COMPLETE wiring harness AND ECM. Plug and play for anything you wanted to put them in. If they came with gas and a battery, you could fire them up in the crate. It's no wonder Chevy has such a following. They've always had great factory HP support and still do.