This is just heresay and opinion......I have no experience with injected and stack set up other than almost buying one for a SBC years ago.
I have seen them running on a serious street motor , but it idled around 2,000 and I was told that it isn't very tractable through low to mid r.p.m. , but made a right fine on - off switch.
They are geared for W.O.T. use primarily , though tuning will obviously make them work through a set range i.e. road racing.
Getting the complete set up would cost more for injected if buying new.
And the show and tell factor is off the charts.
I thought about plumbing one for EFI , which would clear up most driveability issues.
I don't know that there would be a significant H.P. increase over a carb and sheetmetal intake unless your motor could swallow more air than the carb will allow.