[blucar]

The indentation on the firewall sound pad tells me the car had a hot water heater which is not original equipment on a '35 Ford. The orginal heaters were hot air heaters that ran off of the exhaust manifold via a lot of duct work.
My '36 coupe, of which I am the second owner, having owned the car since 1952, has a '39/40 Ford hot water heater. Pix attached.
There are several styles of hot water heaters that were very common in the 1930's/40's, most of them are to large for the '30 model Fords.
In 1941 Ford started to offer hot water heaters as a standard accessory, they were generally mounted in the center portion of the firewall. Many people think that the center mounting is correct for EFV8's.. I tend to think that the passenger side of the firewall is a better location. I would assume that the heater in my car was installed by the dealer, therefore they mounted the heater per some kind of a factory directive.