1966 Parts Catalog:
9-48-7 440 #1858623

1967 Parts Catalog:
9-48-7 440 #2843031

1968 Parts Catalog:
9-48-7 440 #2843031

per GG's "white book" 440 4bbl intake manifolds:
1966 cast #2206000 (part #1858623)
1967 cast #2806178 (part #2843031)
1968 cast #2806178 (part #2843031)
1969 cast #2806178 (part #2843031)

per HOLLANDER 42nd edition:
1966 *264 - #1858623 interchangeable '59-'66 413/440
1967 *492 - #2806178 all Chrysler Corp 440 4bbl '67-'69
1968 *492
1969 *492

1966 thru 1969 intakes shown below, anyone have a pic of a "flat" 440 intake with a July '66 or later casting date on it?