It can be done but you would need a custom tune. Everything from an ecotec bolts up to the super6 as they are essentially the same except for the pistons, rods, balance shaft, flexplate, balancer, torque converter, fuel injectors, heads and lower intake manifold. Forgot to mention ecotec and l67 use the same cam but it is retarded by 2 degrees from the factory in the l67.
To do what you propose, you'd have to remove the lower intake manifold and replace it with an ecotec one. The 2 engines have the fuel injectors in different spots. You could use Yella Terra fuel rails and bung the ecotec injector boss.
Then get a custom tune and one other thing.......it will still be registered as a Forced Induction car. You'd have to get it un engineered lol