4 channel amp bridged to 2 channels , 4 speakers

[ranger danger]

Looking for some advanced speaker wiring help. I have a Zapco ST-4X SQ amp.

The specs on the amp are as follows.
4Ω: 4 x 70 watts
2Ω: 4 x 105 watts
4Ω: 2 x 210 watts bridged to 2 channels
It says nothing about 2Ω x 2 channels bridged

I have 2 6X9 Focal ISC 690's 160 watts at 4 ohm's each in the front doors and 2 Hertz ECX-100.5 4" ENERGY SERIES 80 watts at 4 ohm's each in the front center dash of a 1969 Suburban

My question is can I bridge the amp to 2 channels and connect 2 - 4 ohm speakers in parallel to each channel to get the 2 ohm load times 2 channels and would the amp be stable or could I run the front 2 channels at 4 ohms with the 4" speakers and bridge the rear 2 channels to one channel for the 6x9's for 2 ohms for more power? If I calculate this right, I would be getting 70 watts per channel to the each of the 2 dash speakers and 210 watts to the 2 door (rear) speakers.

I will be adding 2 more Focal 6X9's and a Zapco 2 channel amp to the rear doors later along with a sub and amp that has not been determined yet.