You can up the fuel pressure (and run a variable FPR) along with running 454 TBI (80lb./hr.) injectors to get more fuel. At higher pressures the injectors can't control fuel flow as well (necessitating the vafpr), but currently at 25psi the injectors fueling my 383 only hit about 60% duty cycle. It's doable, but I say only worth it if you want to stick with TBI... it's a little cheaper than some of the port injection setups, but I think I'd still prefer port injection to TBI.