Re: 69 Gibb L78 Nova
That core support looks like a reproduction. The larger hole on the driver side is for AC hoses. The wider opening would also be correct for a 73-74 with heavy-duty cooling system and AC.
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Allen
1970 Nova SS L34 396/350hp, 4-speed, 3.31 gears
1969 Corvette 350/300, 4-speed, 3.36 gears
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