My '27 has nine wires passing through the firewall just above the junction block. The hole in the firewall is chamferred, but there is no protection for the wiring. Did Ford put anything over the wires to protect them from chafing? If so, what?
Outside of the fabric covering the wires themselves at that location: no. At a couple of other spots on the main positive battery lead there is some additional protection of a grommet or two, but that's about it for the whole car.
If a rubber bushing in the hole is not period correct, you might want to wrap a small piece of leather from the crafts store around the wires where they go through the metal firewall. Or you may be chasing a short down the road.
Either that or a piece of old inner tube wrapped around.
The thick wire loom is well protected by the generous soft formed hole in the cowl of the Improved Cars, don't need to add anything.
The '24-'25 metal high hood fire wall got a sort of nice formed folded stamp edge, so the loom is protected a bit less, but still OK.
For the low hood metal firewall, it was just a sharp hole stamped, so Ford put a grommet there to protect the wire loom.
Neither my 26 or 27 have any type of grommets on them no issues yet.