Very good points Brad on the 3-bolt exits on manifolds used with catalytic converters.
You might consider contacting PY member ‘ol Pinion head (Roger) who probably has exactly what you need in his vast parts inventory: https://forums.maxperformanceinc.com...r.php?u=141176
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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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