Fenderwell question

I've seen pleanty of them for big block application but for small block the only ones I see are for early A body. Where have you found fenderwell headers for later(smallblock) A bodies? Yea, no doubt the early A bodies are not as wide as later A's but, I would think the headers would work possibly.

The hooker supercomps in my wagon fit tight to the floor,fenderwell, and frame rail. It would require extensive mods.