Hey, you`ll need to swap the crank rod and pistons, not the heads, but the Australian or Argentinian Heads are a good option. try to find an Argentinian "sprint" heads or "max-econo", Better if the head is from Australia, they was working in his heads about 40 years, Here in Argentina the only change to the head was the adding of a separate exaust and intake manifolds, and a hotter cam(a 221" sprint have 185 HP)
best Regards & sorry about my bad english
Mariano
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Proud VMF´er on the south!
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