Any math majors here? OHC head milled.....

yes, the EGR was functional, sort of. I made a bunch of adjustments on it as it was opening on idle (?) and F'n up the curb idle that had to be changed to get it to run right, then I found the EGR had an adjustment on it that could tighten up the pintle delaying its opening so I had to go back and fix the curb idle again once the EGR would stay shut. It was a lesson in early 80's carbed mechanical smog devices that walked the tightrope of passing the ever tightening smog regulations. Then EFI came and thankfully retired most of this mechanical vacuum timed crap.