well there is 2 ways.
1) Is the ideal way and it includes LT4 High side, low side, injectors, and voltage pump booster, along with a blower cam that has a bigger fuel lobe. Cost will come in around 12k since you already have headers and flex fuel setup. Here is a example.
https://jannettyracing.com/collectio...2018-camaro-ss
2) The cheaper method is to run the LT4 stuff and a meth kit. You will be relying on the meth system for a significant amount of additional fueling. This setup would probably save a significant amount of money but it is the more "risky" solution.