1975 360 budget build

And I disagree with you :D …. The 300 hp crate motor was nothing more than a stock 360 magnum with a 4bbl and headers. They didn't pull out the roller cam and install a OEM 340 FT cam ….
The difference is in the kegger intake/throttle body injection system computer tune vs the hot rodders approach with the carb intake, 750 carb & the 1-3/4 headers they used for the MP offering.

When I did my ‘00 - 5.9 Magnum into my car, I lacked the 750 carb but used a Edelbrock 600 AFB and had a upgraded intake being the Edelbrock RPM vs the MP - M1.

Headers are Hooker 1-3/4 into a “H” piped 2-1/2 exhaust.