If you want to stay EFI, the three intakes I think you should be looking at are
#1 Trick Flow Street Heat.
#2 Trick Flow Track Heat.
#3 Explorer.
Of those the Track Heat will flow the best, it'll set you back about $450. The Street Heat will flow right with the Holley, a couple cfm less, for about $400, and with your current heads/cam will be more than enough. The Explorer will flow way better than stock, but it will be restrictive on a 347, the bonus, you can pick it up for about $250 on Ebay. It's nearly the same as the GT-40 and Cobra intakes. The Holley Systemax intake will set you back between about $550-600.
You don't need 30lb injectors. 24lbers will make every bit of the hp you're looking to get. They'll produce a better spray pattern as well. Getting a bigger cam on the GT40's won't do much for you. Adding a set of 1.7's might. That'll give you about .514 lift, and 224* duration. That's about as healthy as the GT40's will really like IMHO. The secret to this is now matching your components. You don't have any components, other than the injectors that are really high power parts. Adding a big *** cam won't help you if your heads can't flow it.
If you are running the stock? fuel pump, that is a HUGE issue. The stock pump flows anywhere between 88-92lph, and it won't support more than about 260hp, give or take a few. Even if you had your fuel pressure turned way up, which is a big no no when making 280hp with 30lb injectors, the pump can only flow so much.
Take what you have, and match the combo. You'll make solid hp, and you'll be happier for now. You could get a custom grind, but you've already got a cam that will support nearly the hp your heads will. If you add 1.7's, you'll be fine for a cam with your heads.
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