Pinging

[Typhoon lee_ste]

Hello to All,
Purchased a BA xr8 Ute that blew its engine with previous owner.He had a garage install what he tells me is a 290kw motor from an early FG xr8 other than removing the alternator can I find out the engine number?Also after a GT tune at a reputable garage now 6-7 months later I’m getting bad pinging under acceleration,what should I be looking at? I’m an amateur so keep in mind lol.
Thanks.