318 exhaust manifolds on a 360

What's so special about that exhaust manifold that you caint share the castin number?

Hey RRR, How're you doing?????
What's special about the manifold is that you can only buy one with the 2 1/4" (approx.) exit hole and the best configuration (shape) from me. If you could pick one up at the corner store it wouldn't be special??? I've also noticed that members here LOVE a mystery! Many, many members have started threads with, "What is this?" or "Can anyone tell where this fits?" or "Does anyone know what this casting number goes to", etc, etc. I was going to see how long it was going to take for all you Mopar veterans to figure it out. I've only been into Mopars for a few years (if you don't include back in the day...LOL). So I spent many months doing research and a few hundred dollars to come up with this manifold.
I don't expect to sell very many although I already have one buyer waiting for a shipping estimate. All I know is that I don't like headers (or header prices). I don't drag race, although I do like to burn the tires off every now and then. I also know that my city had millions of speed bumps (not good for headers). I also know that it doesn't do any good to have 2 1/2" exhaust all the way back if you are choking the engine off at the manifold. So for all these reasons I came up with a solution and I'm willing to sell the fruits of my labor, investment and research.
To be brutally honest....I thought you would be one of the first to know the casting number. What I really like about this manifold is that it is heavy cast and seasoned. My old 318 manifolds kept warping as you tighten the bolts and no amount of gasket would help. They just made them to thin. These ones that I have are super thick. I only have 3 in stock and I'm trying to get more. If they don't sell I'm stuck with them (my loss).

LET THE GAMES BEGIN!!!!!!!

Treblig