OK, just looked at the gearing commander website. According to the info I put in 16T + 41T can give 161.5mph 16T + 43T can give 144.7mph.
I have at present 15T + 42T on giving 154mph.
But, I have a big clutch slip on my baby

But, which gearing is best for overall performance, don't want 170mph, like grunt down under 130mph. And quick acceleration pleasz

Cheers,