On my Carver 28 (1988), 2 x 5.7L 350 Crusaders i want to replace the packing or the stuffing boxe's.

After winter when i put the boat in the water the stuffing boxe's leak as fu*k but after i start the engines and put in gear it just droppes like a drop every 5 seconds and in the end of the season it has stopped leaking. But this year one of the prop shafts leaked alot after that and i bought some tools to be able to tighten the packing nut and got the leak to almost stop. But i am lucky this was under the kitchen and not under the bathroom becaus i can't even realize how to get to that one. So in winter i will try to replace the packing material or replace the stuffing boxe's with something different..

What do you guys/girls recommend?. I have 2 gas 350 v8 and pay Swedish gas prices so at this point i don't care about the price

And also if the 2 nuts and packing material is best does anyone have link to special tools that fit? becaus all my and the tools i can find here are to big to turn those nuts