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If you're talking about a stroked, 427ci LS3 or a LS7 engine (also 427ci) with ported GPI LS3 heads......no problem; they'll match.
On the other hand, the MSD intake will be for LS7 heads....LS3 heads will not work with that intake.
KW
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1995 Impala SS -- Heads/Cam LS3
1996 Impala SS -- 398ci LL Solid Roller LT4
2014 Chevy SS --- 429ci Hydraulic Roller LS3
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