I put one in a 500b. Had to add one inch to the hood and side frame. Also had to use the front cover from the old engine for governor assembly. It would fit a 350, 600 with a different rear main seal 530 and 630 also. It was never put in a tractor by case. Makes a good powerful tractor out of one. Mine will pull this rake in direct 4th with 15.5 x 38 tires.