Picked up a Brookville coupe and frame at Fall Carlisle and ordered a flat firewall for it. I understand that the body was lowered over the firewall when Henry Ford built these, but I tried to install the firewall with the body bolted to the frame. Managed to get the top in , but I'm having trouble getting the bottom part in. The channel that the firewall gasket sets in won't fit passed the brass mounting bracket as seen in the photos below.(see white arrow). Can anyone tell me the right way to locate and install this firewall. I need to know how to install the lower feet onto the firewall, I need to drill the firewall and bolt these on. Should the gasket overhang the ends of the firewall or does it get cut short of the ends.