Put the 2800 cam in it.
Better match for the low-compression 400 and easier on the current valve springs.
Had one in a 400 with 8.2:1 and it was a pretty strong runner with a 3.23 rear gear and TH400.
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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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