Actual airplane airfoil is:

Wing Root: DSMA-433A/-434A
Wing Tip: DSMA-435A/-436A

I have not been able to find this particular airfoil on the internet although I have seen many others. McDonald Douglas airfoils must not be popular. (Ha Ha) It would be great to have an idea what this one looks like so I can find one similar, as you suggest.

Thank you!!!

PS: Yr comments on LE slats noted, and I think I know where you are coming from. I believe the B-727 has LE flaps inboard and LE slats outboard. If my memory serves, the MD-8X/90 has LE slats that deploy from the top. You may have a good suggestion, however, in that the LE flaps would certainly be easier to build and they would look (and function) about the same.