160-degree thermostat too cold?

Changing your thermostat will do absolutely nothing to solve your problem. Put the 195 back in.

Your answer will be found with timing, tuning or better gas.

You're going to have to either limit the timing curve so badly that it runs like sheeot or run race gas. Take your pick.

To the OP,

What is your current timing curve?

Are you using vaccum advance?

What is your base and total timing?

Is 91 premium by you?

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i've always run a 180 which is also what Be Cool Recommends in all of their systems.