Help! Need manifold ideas ASAP. Car going to shop at 1pm today!

Finished dropping the engine (318) in my 67 barracuda, just to find my headers do NOT fit. Im looking for exhaust manifold options. Does anyone know what exhaust manifolds, of what cars/years will fit? I'm desperate, it has an appointment today, at 1pm, at the exhaust shop, to have my mufflers installed. Please, any advice would be much appreciated. Thanks.
1967 barracuda 318, stock suspension/steering.
And yes. I'm header savvy, they are wrong.