ive looked at this setup, first problem is 4 injectors need to be sized twice as big as a stock setup, if your pushing 400 ponies you need injectors capable of at least 100 odd horsepower each which is a decent size.
This might be a little hamfisted for getting the duty cycle down enough for decent idle fuelling, may as well keep the carb as the ONLY advantage with efi is idle and part throttle fuel trim.
Problem two, and this is a biggy (IMO)
Lets say on a stocker one injector fails, that cylinder gets no fuel, big deal...
Lose 1 of 4 in the throttle body, BIG PROBLEM, leanout city in all holes..Unless you can maybe use them in series where one fails and all fuel stops, wire it thru the ignition and kill the spark before you kill the engine..
One advantage to the setup, better atomisation of the af mix compared to standard because it happens in the plenum rather than the chamber so by rights it should make more power than standard efi, think about a serious efi car with individual throttle bodies, the injectors are as far from the valve as possible to get the emulsion right before its in the chamber.
I wouldnt do it personally but plenty have so maybe im an idiot lol.
hope this helps...
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