Get a True Wet Kit for any American Muscle car off ebay.
Lowering your compression is lowering how much power you make. Its only good for Turbo Charged Setups where you force lots of extra air into the combustion chamber.
When you do a Nitrous build, you want to follow N/A Power setups, Such as using high compression pistons, etc.
Some ITB Setups use a spots to to reuse a on oem fuel rail in the oem stock place and some before the Throttle body. You can use the OEM rail spots to put in your Nitrous Kit.