273

Here some info on mild 273/318/360

273
https://www.motortrend.com/how-to/testing-mopar-273-power-pak-dyno/

318
https://www.motortrend.com/how-to/mopp-0312-318-long-block-bolt-ons/#:~:text=Our 318 now produced 282 hp at 5,000,hp by an intake, carb, and cam change

360
https://www.motortrend.com/how-to/mopp-0307-installing-exhaust-headers-into-300hp-crate-engine/