Is it okay to run two amplifiers for two speakers

If you have two of those amps, you could run them as monoblocks by running one channel of each amp per side. The benefit is zero crosstalk from the physical separation, and there's an advantage in each side having it's own power supply.  It won't increase power, but there are advantages that might result in audible improvements by way of refinement.

I did run both amps by hooking up the speakers on left and right side positive an negative terminals on each amp and it did sound better. The CA-7 preamp instructions said you could use two amps, perhaps two sets of speakers.

No, and if you did that in my presence I would feel compelled to make a citizen's arrest.

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