My current setup is a 306 with eldelbrock heads, Gt40 intake, trick flow stage 2 cam, full exhaust, 255 lph pump, and 24 pound injectors. If I installed this kit would my 24lb injectors be okay or would I need to get bigger ones?
You will have to go to a larger injector. The car will require a custom tune, so I would contact who you plan to dyno tune the car and see what they prefer to use for their tuning. Different tuners will prefer certain lb injectors based off modifications.