2.2 3S stroker , with a GT25R or some otehr turbo of the like which spools nicely . I do belive Scott Ricahrdson made 290RWTQ @2600 RPM with his old motor . Before he was built on stock cams .

Either way this isn't Toyota Tech .

I think a Rotary Miata would be cool . I notice there is atleast one well built SM2 FC Turbo 2 RX7