Has to be big block b/rb. Small blocks do not have 90 degree plug ends.How long are they?
Small block are generally 2 of each length because distributor is in center.
BB has 2 very long and one very short. And 4 straight and 4 90 degrees at cap.
H 3-66B/RB engines
3rd quarter 1967 is for early sbd 1967 cars