We've talked to guys that run dyno's and have been told they have seen no significant HP gains with the 4-7 swap in back to back testing.
However going with the full LS firing order deal has shown some HP gains according to a couple of builders I've talked to. In fact when I was looking into the LS cam cores for my BBC, Mike at Zimmerman racing told me they are worth about ~10hp give or take a couple on an engine like mine. Each engine may vary a little but that was the general consensus. I just had to decide if $1000 was worth it.
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2019 Pontiac Heaven class winner
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