Changing the metering rods in an Edelbrock carb is WAY simple. Ya don't even have to pull the airhorn. Just remove the small cover from the top and pull the rods out. Drop the new ones in and replace the cover.
The only thing ya gotta have is some different sized rods. I bought a tuning kit for my carbs. It cost about $70, iirc. But there are 3 sets of jets and rods, different secondary springs and some other stuff. I got mine at OtterZone, but I dunno if they still carry 'em.
Good luck with it,
