Hey guys I'm getting codes po306 and po171...wht should i do ..?

Did you ever fix that coolant leak next to your EGR valve? That could be causing your P0306. Which is a misfire at cylinder #6, which is next to the EGR valve.

Yeah i got my intake and supercharger gaskets dne...i got the aluminum gasket too...

P0171 is a lean condition, you have a vacuum leak somewhere. However, I have seen that code come from a bad battery connection. Start by reading this. https://www.gmforum.com/obd-ii-trouble-shooting-153/p0171-284036/

The p0306 is a misfire, likely caused by what ever is giving the p0171 code. However. Inspect the spark plug wire, pull the plug, inspect the coil. Because it is also possible the p0306 code is causing the p0171 code. In that case, it could be the injector.