What he said.
Is the old engine/transmission still in place? You got fixed, or folding prop? First of all you need to be sure that the shaft can't just slide out of the boat. Lot of different ways to do that, but if the old engine
and/or tranny is still coupled to the shaft you are good. Second, consider locking down the shaft to prevent rotation. This saves wear on the packing if the shaft is bent.
When you tighten the stuffing box, only tighten just enough so that water
barely seeps through, when the shaft turns. A drip every minute is perfect. When the shaft is not turning no water
should come through at all. Water is the lubricant in the stuffing box. If it is too tight you, will burn out the packing and score the shaft.
Check your zincs too. They are egg shaped lumps on the shaft between the prop and the cutlass bearing. Easily replaced even if you only have snorkel gear
. Only takes an Allen wrench and of course a couple new zincs. Measure your shaft, get the right size. Probably 1". These will keep your shaft and prop from rotting away from electrolysys. A diver can do this in just a few minutes if you don't want to. If you will be doing a haulout soon, it can wait. This is like a yearly check.