the 440cc injectors are a great upgrade for the 1jz... you don't need to buy an aftermarket ecu.. just wind up that boost hehe... but make sure your fuel pump can deliver this boost first
you may find it necessary to get an aftermarket fpr as well....
you could use a 2jz map sensor to regulate the larger injectors i would think without too much worry... i think the 2j map sensor puts out the same voltage as the 1j...