Is this a Fleetline 88 or a Super 88? How did they tighten the injectors up? If you have a lot of return leakage the valve in the tip is worn. You replace the two as they are matched parts. Make sure you change the filter especially if it is a fleetline. If you have the pump off be careful when you time it as the pump drive shaft also runs crankshaft speed. You need to check the timing mark on the quill shaft also.