Hi everyone,
I was shooting 6x6 film at night at a dia de los muertos festival, and after I shot all of my delta 3200, I was forced to shoot a roll of portra 160 at around EI 1250 to get an acceptable shutter speed. It is underexposed by 3 stops.

My question is: how far should I have it pushed?

I have never gotten my c41 pushed before, so I hope someone can shed some light on the situation for me.
Thanks!