Here is a photo of two different Holley(?) Vaporizer exhaust manifolds. The one on the top is more "rounded". The one on the bottom is more "squared-off" and "beefier", especially the area where the hot plate bolts on. Is one earlier than the other or from a different manufacturer or ??? Is one better than the other?
One looks like a Holley the other more squared looks like a Simmons or Kingston