The v-10 did not have vgt, but still had 650 nm from as early as 1500 rpm up to 6250 rpm (limited). 560 hp @ 6250 - 6700 rpm.
That would equal a 4l v-8 with 520 nm from 1500 rpm to 6250, and 448 hp @ 6250 - 6700 rpm. 80% of the engine size, 80% of the power and torque.
Could someone try make that? I only have the demo. 