If that is the 1975 engine, I would recommend that you soak the carburetors first before removng the jets. After 30+ years, the jets will probably be stuck very well. If it were my carbs, I would blow the jets out with 120 PSI air, test them for size and leave them alone.
The jets come out fairly easy unless they are heavilly gummed in there. The secret to the tool is the parallel sides to the blade. A tapered blade as on a regular screwdriver will tend to spread the soft brass jet and make it tighter than ever in the hole.
If you decide not to pull them out, then follow Joe Reeve's suggestion to run a steel wire through all of them because air itself won't loosen gum deposits.