I was able to figure it out thanks to this:http://wordpress.stackexchange.com/questions/78826/inserting-gravity-form-checkbox-values-into-advanced-custom-fields
One thing I ran into is that if I needed the serialized value for a field, the “get_post_custom_values” function worked. Otherwise, the ACF “get_field” function was what I needed for other types of fields.
add_action("gform_after_submission_2", "acf_post_submission", 10, 2);
function acf_post_submission ($entry, $form)
{
$post_id = $entry["post_id"];
// funding status
$values = get_field("reviewer_funding_status", $post_id);
echo "<br />reviewer_funding_status: " . $values;
update_field("field_519f97aab12f7", $values, $post_id);
// rating - overall
$values = get_field("rating_overall", $post_id);
echo "<br />rating_overall: " . $values;
update_field("field_519f989ab12f8", $values, $post_id);
// rating - clarity of mission
$values = get_field("rating_clarity_of_mission", $post_id);
echo "<br />rating_clarity_of_mission: " . $values;
update_field("field_520be9eac3f72", $values, $post_id);
// rating - communications
$values = get_field("rating_communications", $post_id);
echo "<br />rating_communications: " . $values;
update_field("field_519f98d4b12f9", $values, $post_id);
// rating - evaluation
$values = get_field("rating_evaluation", $post_id);
echo "<br />rating_evaluation: " . $values;
update_field("field_520be9fdc3f73", $values, $post_id);
// funder ID
$values = get_post_custom_values("funder_id", $post_id);
echo "<br />funder_id - serialized: " . $values;
update_field("field_519f996ce16ca", $values, $post_id);
}