NHRA regulations

Keep it simple. Slower than 11.49 if it's not a vert all you need is a helmet and if you run a slick you need a drive shaft loop.
Keep any fuel lines and fuel regulators off the firewall.
If it's auto make sure the neutral safety switch works.
Rear fuel cell requires a firewall.
Rear mounted battery needs a kill switch.

Faster gets more costly.

I do have a rear mounted fuel cell. Same with the battery.

The early barracuda has that fold down divider between the trunk and backseat. That wouldn't count as a "firewall" would it?

My regulator is on the inner fender of the passenger side. If that's not a good spot, where can I put it?

I really need a battery kill switch even if my car is only running 12 seconds in the quarter? And 12 seconds is a complete guess since I've never taken it to the track