Code:
http://twodimes.net/h/?z=1280316
pokenum  -h qc th  - 9s 7s  -- qs 9h 4s 

Holdem Hi: 990 enumerated boards containing Qs 4s 9h
cards  win   %win  lose  %lose  tie  %tie     EV
Qc Th  494  49.90   496  50.10    0  0.00  0.499
9s 7s  496  50.10   494  49.90    0  0.00  0.501

http://twodimes.net/h/?z=1280314
pokenum  -h kc 8h  - 9s 7s  -- ks 9h 4s 
Holdem Hi: 990 enumerated boards containing Ks 4s 9h
cards  win   %win  lose  %lose  tie  %tie     EV
Kc 8h  494  49.90   496  50.10    0  0.00  0.499
9s 7s  496  50.10   494  49.90    0  0.00  0.501
Interesting topic. I guess the edge is so small that it's statistically insignificant.

Anyways, screw it. With the flush draw and middle pair you push push push.