Just to clarify one thing, there was not "mod" required to make a Tomcat a Bombcat except for the Bombing Rails, all Tomcats were built with the air to ground weapon delivery system already installed (the system was similar to the A-7E's weapon delivery system).
They could carry Mk 80 series GP Bombs, GBU-10/10/16, GBU-24B/B, CBU's, Mk 62/63 Quickstrike Mines and practice bombs/flares. The Lantrin give the Tomcat the ability to designate their own targets and not have to rely on another source, GPS came around in late 99/early 2000 depending on squadron and this allowed for the car