A big block definitely looks the part in a jet, and I'm sure that's what I'll always run. But with the TR options on an LS it's doable. I'm sure with a little work you could mount injectors in the base of a TR and then use twin throttle bodies up top to meter the air. All you would need would be one MAP,TPS, etc to calibrate things with. Put a set of Holley's fake BB valve covers on the LS and you're golden. It'll pass the 20' test.