The passenger exhaust manifold looks like a 340 but the driver looks like a big block manifold. I know it shouldn't be and it probably isn't but I've never seen a 340 driver (A body) like that one?? Could you post more pics of the manifolds and their casting numbers (with pics). Could be some kind of B or C body small block driver's manifold??? A 340 A-body driver's manifold should look like the pic I posted.thanks,Treblig
