You underexposed by a full two stops. (I consider 160 film to REALLY be 100 film.) Thus you need to over develop by about 25% - 33%, or a bit more. You will attain decent highlights but shadow detail will be pitiful. But, honestly, you should have little problems with color-crossover and might be surprised with how great your highlights look. Midtones will be OK but not ideal. - David Lyga