car is stock less a K&N filter and LMS tune, but now stock. I could tell before I was getting spark blow out because of a lot of hesitation. I pulled my plugs and they were worn at 40-50

My SHO was at the dealer last September when they replaced timing chain guides, timing chain, and chain tensioner at like $3k.
they did something with the door lock recall. I think they just replaced some IDK.... I did have a fuel pump recall fixed at one point due to fuel smell in the car. I drive a lot, and I work 2 jobs with 2 kiddos I am super busy so yeah the car maybe somewhat neglected, but like I said it still seems to run good. I out ran a 2016 GT Stang on the highway just a week ago lol it had at least exhaust I could hear it nice and loud behind me as he got a little smaller from 60-110. I love the car and want to maintain it. The body and interior and wheels are all still in great shape so it looks great and still gets lot of looks and compliments.
The tick is rhythmic. It's slow at idle and speed up with engine rpm. I took off my spark plug wires one by one and the sound never changed which I believe is supposed to be that way for top end ticks, I believe bottom end ticks / knocks lessen when you pull the plug on the damaged cylinder by taking the load off of it. I think that is right but I can still beat on it and it hasn't blown up. Like I said also a reputable friend and local race engine builder / tuner agreed its a lifter or something. I never noticed any metal in the oil when draining.
Do you guys think I should have the dealer address all of this at once, or do PTU, coolant, trans fluid changes elsewhere ??
I only want the dealer to mess with the engine tick and I need the car reliable so I guess I'll have them look at the alternator, it looks like a pain to change where it is.
suggestions ??
thanks in advance guys..... hoping this isn't a huge repair