How and why is there a sharp, masked paint line on the interior of the firewall? No paint on the top half and underside of the cowl. Is this for ease of grounding or something? It definitely took effort, which means it was done for a reason.

This is in my '68 Charger...



11.33 @ 118.46 on motor
10.75 @ 125.35 w/ a little spray
Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race
Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023