Isn't that entirely spot welded? I think any fasteners you are seeing are for hood hinge bracket, cloth padding, etc.
You are all done except for drilling out about 50 spotwelds...
'32 is about the complete list of Ford V8's with removable firewall. My '33 firewall needs to come out for some retrofitting, since it is now employed as part of a '32, and I am not looking forward to the festivities!