I agree with the guy from TBI chip's, I would go for it it and keep it TBI, but that's just me!
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You don't need any of that if you are keeping the stock TBI. Stock pump, reg and tune will work. Putting Vortecs on doesn't increase fuel consumption.
The TBI ECM adjusts the injector PWM if the O2 sensor reads constant lean. Again, though, Just changing to Vortec heads and nothing else does not require more fuel. A Vortec head is a lean burn style, if anything you won't need as much fuel. Maybe the guy is thinking that you are going to change over to MPFI or something.