If you have a Holley carb it has a dedicated PCV Port, as shown here:
To remove the old filler tube I used a slip joint wrench with a piece of inner tube rubber wrapped around the filler neck. Get the wrench as close to the manifold as possible.
Or you could use a strap wrench if you own one, I don't.
I put some Red RTV on the new filler neck before I tapped it into place. The new neck can be installed by placing a scrap piece of wood across the top of the neck and tapping it into place with a ball peen hammer. Just be sure to orient the PCV valve in the right direction before installing the tube.