The only possible issue I see is the valve to bore interference with the 2.11 intake valves.
Be sure to check for that at full valve lift before sealing the deal, otherwise why not run the 061s? If they’re fresh then do it.
Be advised that the rockers and pushrods from the 143 heads aren’t compatible with the 061 heads.
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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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