Put some dished pistons in it or change the heads.
Two choices.
If the short block is already balanced and assembled then a head swap is likely the best option. Swapping to the correct heads or swapping to dished pistons will be a wash either way at this point.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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