We've already got the LS series, 5.3L, and the Northstar (ultimately, I'd like to see an Ultra V8 or Northstar II replace the current Northstar lineup). As such, Vortec I dont see the need for. The 5.3L would fit well enough in a tuned up 380 HP version for the upper level. If we must, drop in an LS3 to kick the butts out of the other guys top V8's... and a DI 320 HP V6 would do wonders as the base engine IMO. Or a detuned 5.3L.