lq4towing

I will have the intake on monday. Found a 07 intake with flex injectors and rail. Already have the injector plugs. I will be porting the heads myself-done a bunch. I do want to ask where ls heads need work at? I'll be gasket matching the intake and exhaust,opening up around the guides. Do I open up the runner up or down? Lastly I will need the 03 vette fuel filter correct? Running the return line to the filter? Hey, Thanks a bunch guys,really helped a LOT. After all the assembly fun is over I will need a good guy for the tune as well. Thanks

Jeremy