I was looking into an RB26 but I don’t wanna do an AWD conversation and there will be a lot of work to do that with RWD but I will look into the S54B321FZ-FE
4.5L Straight six
240 hp and 300 lb⋅ft
It's Toyota. hard to source.
S54B32 Is a capable motor and the 6 speed it comes with is also supposed to be rated for 700+ HP.