box port question

Hey guys new member. Been into car audio a while but just getting into custom more advanced builds. Looking for opinions, others experiences etc.... Really need help designig with ported boxes. Got new subs n amp bought and waiting for me to figure out a box and all the install details...

I have a Mach 1, 1969 fastback Mustang and I am converting the center console into a sub box for a JL 8w7. The sub will be forward facing and deflect base off of the dash, bathing the front seat in bass. I am building a ported box tuned low. I have four other 8's in the car handling upper and...