Hi Jose
,
Welcome to this forum.
When I've used a twisted leader of 140 lb's connected to a say 5 - 6 ft 80-120lb's bite leader a mate of mine tied them for me using a " roll knot ".. I've not tied this myself and did not see it being tied because I gave them to my mate for him to do it for me at his time available. I've got about 12 rigs tied this way and use them sometimes. It looks quite nearly done & strong too.......and I have had no problems casting as well when I've used this rigged set up.
Normally twisted leaders is of good supple mono shock leader like Varivas & the bite leader is either mono or flouro carbon leader material. It's personal preference......Fluoro is a little too stiff for a tied twisted leader in my view.
I've not heard nor seen as many people here in Sydney, as I used to in the past people using twisty's/bite leader set up. I'm seeing more and more people using FG knots or PR knot connection these days.
There could be the more experience GT fisherman members on here who could give other connection knots for your application question.
Tight Lines & safe fishing to you.
Regards
Leo