Hoping someone can help me identify a smog tube manifold. I have 2 tubes that are similar except the check valve mounts on the opposite end. I know one tube is the FE big block RH tube, and I have one that when sitting next to the FE tube and the 4 nut-ferrule tubes are oriented the same direction it has the check valve mounted on the opposite end. Anyone know what this is correct for? Thanks for any help. Andrew
390-428 Tube: Top Photo
Unknown Tube: Bottom Photo