440-1 header flanges

Im in the process of starting the mock up of my boosted low deck big block swap in my valiant and im trying to source out a set a 1/2 thick header flanges for a set of 440-1 heads does anyone have a cad drawing of the header flanges or a basic drawing of set of flanges for these heads i could have turned into a cad drawing. Any and all help is always appreciated*
Thanks Aaron