When you add up the cost of tapping for screw in studs and the added cost of conversion studs with 1/2-13 threads on the bottom ($100) plus the heavy milling to try to get 9:1 compression and expensive Cometic .027” gaskets ($200) the 6X-8 heads are a better way to go.
No expensive conversion studs and no tapping needed for the 6X-8 heads and no heavy milling requiring a cut on the intake side of the head.
If your engine is apart you may be able to cut a small dish in your pistons to utilize the 6X-4 heads. Food for thought.
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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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