I dont think you will realy gain much swapping a stock 300 6 to a stock 302. the 6cyl actualy seems to have more torque. The bellhousing on the 300,302, and 351 are all the same, and the motor mounts are as well(i believe)The difference is you will need a different flywheel. I went from a efi302 to carbed 31, and would never go back.. I gained power, AND milage.