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First when using the 351W there is no other header excepect fender well and they are costly. You can not us a rear type ford header. I have tryied. If someone knows let me know but i have ask in two other post.
I just got a message from anotherforum reader asking where he could get a Toy box. PM me with your email addy and I'll put you in touch. Don't know how much help the stock box is going to be, it's nearly the same size. Have you tried contacting Sanderson headers? Used to be they would modify their headers to fit if they didn't have for the application.
Have you considered using a stock type exhaust manifold? I was very limited with my 302 and Volare steering box in my 49 but I found that 64-66 Mustang cast iron exhaust manifolds work great. They should fit the 351W as well. I know they don't have the performance potential of headers but they clear most any steering box...
I'm going to guess that you've got the engine mounted with it centered in the chassis. Is there any reason that you can't cheat the engine over to the passenger side about an inch? Many, many factory installations are offset. It's a common thing.
Edit - Vern and I were thinking the same thing at the same time!