While you're at this stage of your project, I would strongly recommend fixing the firewall. Ask me how I know... 😉 This is something that can be done with not much experience since most of the firewall won't be seen after you re-assemlbe your vehicle (unlike doing body work). However small your effort, it'll look much better than original. If down the road your project direction changes for the better, you won't regret having a nice firewall.
Here are some pics of mine -- nothing fancy, just wire wheel, sandpaper, some bondo, primer and paint. Good luck!
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Thanks for the reply Kiko-
When I said stop at the firewall, I was talking about the other side of it!
Having said that, I would like to know the product you used on your firewall.
My plan has been to redo it but I haven't thought about my methods yet.
Corey D