Mr. Cab
FYI... it appears in the provided photo that the big triangular shaped holes in the pictured firewall are not original; this firewall has been cut and modified for some other use. It is in no way original for a '30-31 Model A.
Cab,
sorry...but are the apparent 4 or 5 holes in the passenger side triangle area also paint spots? The photo isn't all that clear. Just asking, no offense.