FWIW, and assuming I'm interpreting your original post correctly, you were slightly better than a coin flip:
<font class="small">Code:</font><hr /><pre>
http://twodimes.net/h/?z=3825725
pokenum -mc 500000 -o8 ah 2h 4d qd - ac 7c as 9d
Omaha Hi/Low 8-or-better: 500000 sampled boards
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
Qd 4d Ah 2h 168511 185957 314043 0 236939 4735 5243 0.502
As Ac 7c 9d 167288 314043 185957 0 20766 157422 5243 0.498 </pre><hr />