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Full Disclaimer, I'm not an expert, but I recall reading or hearing that the expansion of rubber brake lines were a thing of the past and not much of an issue with newer cars.
I would check in with people who road course a modestly prepared car regularly (similar to your street build) and see if they've had any problems with the factory brake lines. If they've reported no problems with OEM lines then go back to them and try for yourself.
Judging by your other post you will be attending National level events, I would not risk losing out on a big win or contingency money over something as silly as a brake line. Probably won't be protested but for someone who wants to move up a spot to win money or a trophy and a hard ass on rules they might throw down the paper. For locals it won't matter and no one would ever know.
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