Yes, the 4 bolt and six bolt manifolds use the same bolt pattern.
At one point the factory decided to use only 4 bolts no matter what engine size.
Even some 6 bolt manifolds were bolted on using only the middle 4 straight out of the factory, 1965 would be one example.
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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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