I've got a 1974 GMC Sprint project car. It was originally a 350 small-block Chevy with a TH350 trans, but I sold the engine and trans and installed a 454 [big-block] and TH400 trans in it.
We recently spent some time with Chevrolet at the 2019 SEMA Show, and unsurprisingly, the Bow Tie brand had loads of crate engines on display. It makes sense – after all, these lumps-of-go are used ...