70 dart swinger slant turbo build and mild restoration

Yep well spoken

And that's where I got my header flanges and those turbo flanges is there any reason to run a split flange?

if you are running a split housing on the hx you could split the the manifold. supposed to make it spool a little quicker. but you would have to run two wategates. one for each side.

i dont recall reading it, is your car an automatic?