On any Holley carb. I work on to remove the needle and seats first remove the screw and nut without turning the nut. Once they are loose unscrew the screw and look at the position of the brass slot that the nut holds, now remove nut and needle and seat assembly together while counting the amount of turns (within 1/8 turn)it takes to get it out, write it down and then look very closely at the needle and the seat, there will be some debris in their, maybe really small If you can't see the debris and remove it either replace it with a new one of the same size or bigger opening that the needle seals on, they come in .090,.100,110, and .120 with the Viton tip seals on the needles.
When it comes time to reinstalled it or the new one use the same amount of turns it took to remove it as a starting point and go from their
BTW, Mopar six packs set ups rock Especially when set up correctly and jetted correctly for that motor
Good luck, let us know how you do and find out