Thank Pat, a lot of good infromation. I didn't make my header flanges, they are made from 3/8" steel and by me never doing them before and these being ford heads with chevy exhaust ports I thought I'd leave it to more capable hands. I also look at the car a lot.

I do have one concern, with the headers on the engine I did measure them about 10" off the ground to the bottom of the lowest tube, is that ok?