383 LT1 with SC Injector ?

Looking for a good size injector for a 383 LT1, Trickflow Heads 315cfm, 8LB SC.

60LB? 80lb?

You have to start with an estimate of your flywheel HP, then use an online calculator to get the injector size. Remember to use the brake specific fuel consumption (BSFC) for a supercharged engine, which is sustantially higher than a normally aspirated engine.