Should I replace the stock 360 intake?

The stock intake is a very good piece. I wouldn't consider changing unless you are going with headers and a bigger cam. There are some pretty fast purestock cars using that intake.
spend the money on 2.02 J heads if you dont have them already,port match it and dial that thermoquad in and fool the crap out of people//it still good factory stuff...I think the thermoquad was an under rated piece//cam,timing and get that secondary air door right and enjoy that 360 torque !!!