Fuel pressure regulator location...

Why can't you have it on the firewall? I'd go with the fenderwell, but I dont' see why you couldn't do it on the firewall. but then again I definitely don't know everything.
 
On the passanger fender by strut tower.

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no fuel regulator or distribution block within six inches of front of firewall..nhra general rules. If youa rent track worried then mount it on firewall. Mount it on fender well. dont go behind louvers in firewall as this would put it behind firewall and is def not track legal.