Engine Exhaust Pipes for BB?

[BT Classics]

Getting rid of the headers and putting original style exhaust manifolds on the 454 BB in a '72 C-10. Who makes engine pipes that will bolt up to the original manifolds?

Also, the rest of the exhaust system is 3". Is there anyone who could make a set of 3" engine pipes that will bolt to the original exhaust manifolds?

I am not worried about the rest of the exhaust system. It is just getting the correct bends to get from the engine compartment to under the truck.

Thanks.