Build advice ground up

Good day everyone!
I'm currently in Iraq for another tour, home is Tamapa, FL, while I am gone I want to build up & restore my car. As of right now pre-project: Black 01 Cobra 100k miles, stock except,
4.10gears, Spec Stage3 Clutch, Spec Alumn Flywheel, Steeda Tri-ax short shifter, 18x10 rear 18x9 front black s-style rims, Power slotted rotors 18, short antena, black head light & tail light covers, CIA kit, and a SLP catback kit (loud mouth)...I would like to have a save street tune with about 600-650rwhp. What would be the best path to take to reach this goal. From engine to exhaust. Rebuilding my engine I have or getting a crate engine to start? I would like to keep the deep throaty bass sounding exhaust so was thinking of mating my SLP Loud mouth with MAC long tube headers and pro chamber...but I'm open for anything....I just want to build a good tuff engine with a roots/twin screw style blower on engine (KB Blowizilla) etc.....So where should I start??

Side note: Does anyone know where I can get the Agent47 door panel replacements..they seem to have stopped making them..

Thank you for any info or guidance,
SSG Dunbar