puting in a 440 in a 66 Baracuda I would like to keep the inner fenders in the car how or what can i use for headers or manifolds???what brand make or year or am I on my own
You're definitely on your own. I don't know of any off-the-shelf header to put an RB engine in an early A, much less an underchassis header. A 440 into an early car has been done, but it's not a popular swap for a reason; it really doesn't fit well.
Have you considered flipping C-body manifolds upside down with short stacks through the hood?
A member here made his own and ran them forward and then back. I'm not sure how good that might end up being but having a 65 and more than a couple big blocks I think you need a TiG and some really good fab skills to get anything in there.