Does the '46 have a front mounted distributor? Speed equipment is out there, but few and far between and it's getting pricey. I have a Nicson 2x1 intake and a Knudsen head on my '51. I had to build a split manifold as no header is available (Red's used to make one but discontinued it a couple of years ago). I have a Cyclone head for another project I'm working on. Not sure how well it will work, but I'm trying to modify a header from a 200 cu. in. Falcon six to fit the flathead six. I found some plasma cut intake/exhaust flanges for the flathead six which will make things a little easier. When I get something worth looking at, I'll try posting pictures.