If the cost went from 1200 per manifold to 6500 would you be all over it? Casting went from 6500 to 25000 due to intricacy of the lower section on these pinched manifolds. Went from a simple sand cast to a complicated aluminum fill. Sand cast would of cracked under any stress. So the math doesn't make it practical.
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I don't have an M code anything (except my Superbee 
) but if I did I'd be all over this like a starving man on a loaf of bread. Deposits on parts not made are investments. And like any investment there is a risk. Most of the time you win, some of the time you lose. If I needed the manifold and it required a $600 deposit with another $600 at delivery, all I'd say is "who do I make the check out to?". IMHO it's worth the gamble. As to the look of the repop, make it look as exact as possible. On the back, non-visible, side of the manifold cast some identifier that shows it as a repop. That way on the car it looks original, in your hands you can tell it isn't. None of this is difficult, just costly.
