Swapping an SBC into a clapped out XJ or XK, sure, taking out that gorgeous inline 6 out of an Etype for a golf cart powertrain......is burning heretics at the stake still a thing??
The drivetrain was developped by Jaguar's in-house restoration shop. 295 hp, lighter and faster than the original. 0-100 km/h in 5.5, range 270 km. Honestly, I'm more insulted when people swap-in a mail-truck grade 350 under the bonnet. Still, after hearing an E-Type, I suggest the e-swap be limited to terminally seized and cracked-block examples.
Oh, btw, Jaguar will offer full or partial electrics in all of its models by 2020.