I’d upgrade once you get to around 400 crank go, or 320-340whp.
Done right you can pretty much put any size injector you want - if you have the ability to tune.
347, 205 11R's, Box R Intake, Ported lower, custom comp cam, 42lb injectors, 255LPH, pro-m 80, 75mm Cheap-ass TB, 1 3/4 x 3in LT's, exhaust by me, A5 trans, 4.10
422WHP/456Ft/lb. Tuned using QH by Tony @ Tuners Inc.