May I suggest to you that you may want to look at the Model L vaporizer/regulator and determine if is rated capacity. The smallest Impco converter is the model J which is rated for 100 HP and typically installed on the small engines used in lift trucks. The other two converters, the model E and the model L are both rated at 325 HP. The practical difference between these two is in the locations of the inlet and outlet nozzles. The model L was designed to be a lower cost alternative to the model E, and the model E seems to work better at higher power outputs. The initial setting of the large screw with spring is to lightly seat it and then back it out 3 to 31/2 complete turns. This would be your idle air/fuel mixture adjustment. Your trucks full load-full speed adjustment is performed as recommended by OEM with the use of a carbon monoxide meter. There is an old school way of performing this but I can not spell it out for you in an open forum. If you need additional help contact is possible through forum profile.