Originally Posted by 68Mercury250Ranger

1 barrel carb and log manifolds on the 300 6cyl were meant for industrial application, under 3000rpm operation with a steady load. 500 cfm edelbrock, dual plane intake and a pair of shorty efi headers and your hp would probably dial in 100hp increase from stock form, even more if you put an aftermarket set of timing gears in it. that would still be a very reliable /drivable form and increase your fuel economy and pulling power>>>torque. this engine has so much potential that was only partially tapped when they put efi onto it. UNDERAPPRECIATED !!!!!!!