The outlets were in slightly different position between the '67 GTO HO manifolds & the '68 GTO HO manifolds. Twenty plus years ago RARE's left hand A-body/2nd Gen Dport manifold was patterned off a '67. Know I had a friend that had issues with fitting just such a manifold on a '70 4spd T/A. That issue was addressed by RARE with more correct Dport manifolds being offered for '68-70 A-boys.
On a true '70 RAIII restoration, I've sought out original '70 RA III manifolds in great shape. Which manifolds, it all comes down to what ones building or restoring.
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Buzzards gotta eat... same as worms.
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