But I've heard of no one actually doing it.
Came here for this. The problem with both Ford's and Chevrolet's e-crate motors is that it was just the motor. No power motor drive inverter, no speed controller, no computer, no battery options, no charging system. Nothing but a bare bones electric motor.
had either one of them offered an end-to-end solution, or just all the proper bits to work with their motor, they might have taken off.
Most people today who want to electrify a classic car will just steal the guts out of a wrecked Tesla instead, which is a complete EV package.
Here's a company that does just that to many classic European cars (they're base https://www.youtube.com/@ElectricClassicCars