I've never heard of EFI "taming" a big cam. Certainly a cam with lots of duration and overlap can "tame" a big displacement engine with a high static compression ratio, but I don't believe EFI is going to make a radical cam any more appropriate for the street. I will say that that idle and low rpm behavior in a "hairy cam" situation is easier to manage with EFI as you really don't have to worry about fuel metering problems due to low vacuum like you would with a carb. It's been said many times on this board and I'll say it again, EFI absolutely will NOT outperform a well tuned carb at the top end. However, part throttle street manners of a well sorted EFI system can't be beat, IMO. To answer your first question, my throttle response is excellent, but that took over a thousand dollars worth of dyno time to realize.
As for sound, in a word, nonsense. EFI has no effect on sound. I can't even begin to fabricate a plausible theory why it might, so I call BS on that one.
