Keep on mind that unless the heads have been modified to accept 1.65 rockers they're not an option here.
They are not an easy bolt-on, pushrod slots need to be elongated or eliminated altogether along with the installation of screw-in rocker studs and pushrod guideplates.
The 389 heads use a machined slot in the head to guide the pushrods, not a separate stamped steel guideplate from the factory.
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