ok, so, im thinking about getting my head p&p from patriot performance, and i have a few questions about what to get and whats what. ive been sorting through a bunch of threads i found in search and learned alot, but just want to get a few answers to fill in the holes.

first off, whats the difference between the two? patriot performance

2020 2.2 OHV Stage I Bare $550.00 no exchange
2021 2.2 OHV Stage I Assy $695.00 no exchange

also, what else do i NEED to upgrade? and if i dont NEED to upgrade, what should i upgrade while i already have the head off? (boost is def a possibility in the future, maybe even a cam swap(if its worth it))

i know i read about replacing retainers retainers

should i also replace springs (springs)

rods??(clicky)

and for the cam in the future would i need these?lifters

for the roller rockers i seen on jbody performace, they had 4 diff kinds, whats the diff between them? (ie. 1.5:1, and 1.6:1)

JP0547 - CompCams 1.5:1 Magnum Roller Rockers for (2.2L LN2)
JP0548 - CompCams 1.6:1 Magnum Roller Rockers for (2.2L LN2)
JP0549 - CompCams 1.6:1 Stud Mounted Extrude Honed Aluminum Rockers for (2.2L LN2)
JP0550 - CompCams 1.5:1 Stud Mounted Extrude Honed Aluminum Rockers for (2.2L LN2)

also, what about the valves, i seen car customs had them 1mm oversize. is that something that is worth it, or is it just going to hurt myself until i actually boost my car? (valves)

so basically what i am asking is, all them parts i posted there, would they work with each other? and most importantly, is it something that i might as well replace while i have my head off, and will they actually give me gains?

once again thanks for your help guys, i wont be able to check this again till like 6 tonight after work.