12 Second N/A Slant 6?

OK, we added lift W/more aggressive opening ramps by employing 1" lifters.

Now, can we add more lift by going to (affordable) higher ratio rockers?

Is there any way to modify the stock rockers?

We don't need exotic roller rockers for 5500 RPM so a simple 1.6 or 1.7 ratio rocker would be nice.