I finished the firewall on the inside. I still have 2 places left to patch where the strut tower braces go through, then on the engine side of the firewall I need to grind and smooth all the edges. I will use silicon caulk to seal up the gaps to keep rust away then spray it with a good coat of paint.
The other fun thing I did was try and fit the heater core back on the car and it no longer fits :) So I guess I can either do away with the heat all together or I can use a smaller heater box. I will cut one of the heater boxes I have up and see what I can figure out. I don't really need vents or floor heat, just defroster only would be fine so I might be able to eliminate a huge amount of mess under the dash. I could then use the side vent openings for 2.5" lcd screens for rear view mirrors