So your cam is the 4-7 swap. Usually it will tell you that on the cam card.
The other firing order listed with the 4-7 and 2-3 swap is just the Chevy LS firing order that has been pretty commonly used in SBC and BBC applications. Last I checked that cam core was $1000 from Comp and hit or miss on availability. Haven't seen it used on a Pontiac.......yet.
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