I too feel your pain.
As for headers, I have 1 3/4 headers on my 351C with an FMX. I was thinking they were from Headman but I am not sure. I bought them through summit. I really wanted the 1 5/8 but ran into the same problem and didn't have the guts to order the ones listed for c4 only. Really annoying since 351's never came from the factory with the c4.
As for durability, the fmx is very good. My understanding is the durability went c4, fmx, c6. But I know several people who swear by the fmx. The downside is weight. The fmx is a cast iron case where the c4 and c6 are aluminum. I am waiting for my leaking fmx to die so I can replace it, but I am afraid as long as I keep pouring oil it it, it just won't die. Guess I need to get more HP.
I have seen a shift kit for the fmx but that is it. If it were me (and it might be) I would replace it with a c4 or c6 down the road. Just because of parts availablility. If you are gentle with closer to stock hp and don't race, I think the c4 is the way to go. If you want bullet proof, go c6. I am thinking of getting a c4 with upgraded clutch materials myself.
You are probably tired of reading, I am tired of writing. Good Luck
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