I have a chance to purchase a dual quad Mickey Thompson tunnel ram intake manifold. Need to know the correct casting number for this unit. the manifold I can purchase has a casting number of 3746409 if this is correct for the 409 engine, I may want to sell it after I get it, not sure I want to run this manifole very cool looking but I am up in the air as to wanting to keep it. thanks ahead of time to those that reply.