1967 barracuda electrical question - main harness connectors

Sounds like you mean the "bulkhead connector". Either way, most connectors are "56 terminal" type, also called "Packard 56" and "GM/Mopar style". You can find photos on e-bay. The male terminals are easiest to remove (your question). You squeeze them longitudinally near the base to close the gap, and wiggle them out. I use curved needle nose pliers or some funky pliers I found that have V-channels on each side.