Here's some info from
Old Fuel Injection:
"Camshafts
Camshafts are an important selection with EFI, pick the wrong cam and your computer be unhappy. Contrary to popular belief, a bigger cam will not necessarily make more power; in fact it can sometimes cost you performance. Stock cams actually have a very efficient profile and shouldn’t be your first engine upgrade. Larger cams might make a little more power but will generally shift the power band of an engine upwards. If your vehicle has stock heads, intake, or both, installing a larger cam is a waste of time and money. On the other hand, if you’ve got a good matched set of high flow cylinder heads and intake, a cam change can be worth the effort.
Large cams that change the engines manifold vacuum will confuse a Speed Density EFI system which will improperly calculate engine load. Large cams that cause a surging or pulsing of air at idle will confuse a Mass Air Flow EFI system, making idle quality suffer. If you still feel the need keep the lobe separation of the cam at or above 114 degrees. Be cautious with lift over 0.5�; any more might create an interference if the timing chain brakes.
A cam swap might need larger fuel injectors! The computer is programmed with the stock cam profile, so it knows how much time it can hold an injector open. If your cam opens & closes the valves faster; small injectors might not have enough time to deliver all the fuel. A larger injector will deliver fuel faster. Changing the cam and injectors will benefit from EFI programming of some type."
