I found this manifold at the junkyard....4006741... Will it fit my 1970 duster with ps and a 340... He wanted $150 for that one and just a regular 360 passenger side one...
4006741 is a 72-74 318 a-body left/driver side manifold, should fit your 70 Duster but the price sounds kind of high to me for a 318 exhaust manifold, maybe if they were both 360 ones, would be nice to have a matched set on a 340.