Did you check those chambers for Volume? The info I have and the chambers I measured on my #46 heads says they are 73cc chambers and when I checked them I got 72cc. Mine had press in rockers as well which I drilled and taped for screw in and I enlarged the exhaust valve to 1.77 on my 400 build.
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Greg
'78 Trans Am - Y88-R LS3/T56,
Holley EFI, UMI Performance
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