Just an FYI here, it is certainly possible to run an LS/VTEC using a stock OBD2 ECU. The head would need to be OBD2, and you'd have to use an ECU from an engine that's similar to what an LS/VTEC is (a GS-R ECU perhaps, assuming you're also using a GS-R intake manifold).
So it's not impossible, just not the best choice and certainly not a good choice if you intend to tune...