For a xtended swingarm you will have to disconnsct the parking brake and remove it and get a p block off. Also every quad reacts diff. so the jetting will have to be up to the performance of the quad.
Just watch out with the torque on a 454 you will rip that rearend out in no time. Although the 454's were in the 70's were geared down from performance.
I am going to buy noss heads but I really need to know what kinda domes to order with it i run 87 octane and i was wondering if I would buy the 21 domes would i have to run 93 octane? And also for 21 domes is it ok to run 87 octane?