These engines are so efficient you'll only gain 10-15 hp for the 1500.00 cost of the headers plus the typical 1000-1200.00 installation cost plus within a short period it will throw an 02 late code which will have to be edited out.
Also you're taking your chances supercharging the 392 with the fragile cast pistons.
You'll need a tuner who has some good experience tuning these engines.
Mine blew at 6 psi on the dyno.
I eventually wound up sending it to Modern Muscle who tuned the Procharged 426 to 646 awhp.
You have to have money and should have at least 20-25k on hand if you're going to SC.
Plus the transmission will only handle 600 hp.
Ask me how I know.
After the transmission blew I detuned it from 10 psi to 9 psi.
Forged Arrington 426
It took so long to get the SRT back running I bought a 2018 Trackhawk demonstrator with 10,000 miles in March 2019 for 75k.
Then it got written off Oct 2 2022 when I guy hit my passenger 1/4 panel changing lanes at the last second and spun me into a guard rail.
The insurance gave me 2k more than I paid for it.
I still have my 9 psi SC 426 SRT
but I wanted an EV and didn't want to wait for the Chevy EV Blazer and decided to buy a 2023 BMW EV iX M60 with 600 hp at the wheels and 750 ft.lb of instant torque.
I took delivery in December 2022.
It will never blow the engine.
I modded the Fugly Grille as I used to be a bodyman and painter.
I also painted the black lower parts red to match the color of the car.