Uh, no... nobody make anything! There's not much you can do. You can make your own headers, of course. Heck, I'd start with two right side V-8 headers and make a flange to fit the I-8. That might work... Or just get a "make your own" kit and start cutting and welding.
The intake would be harder. You can make a steel tubing intake similar to making a header though. Would be real easy to make intake tubes for Weber side drafts! Four 2V Webers sticking out the side would look great!!
Call Isky, Crane, or some other cam grinder and see if they can still grind a cam that long. They won't have new blanks, but can easily regrind a stock cam and get you a bit more power.