Lift kit alteration!?

Sup guys! New on here and will start posting pics today.
MY BIG QUESTION:

I have a 2021 tundra 1794 4wd with a 4” rough country lift kit. I have the opportunity to get pro comp coilovers for dirt cheap. The coilovers are rated for 6-7” of lift. I bought a ready lift rear block lift kit that’ll lift the back of my truck 5” (which is typical for that size coilovers) I also bought a bigger sway bar from kit.

will this suffice to run those bigger coilovers?
Will I have any other issues?
I’ve heard a lift shop tell me not to do it but idk if they’re trying to get me to buy a whole new kit because they wouldn’t tell me anything else I needed or what it would harm on the truck if I proceeded.

hopefully there’s enough info here to where someone could help me. Thanks

 

Thank you!

so I already have a sway bar drop blocks and it should keep the same angle on my links. You think that’s good? Any other concerns come to mind?
Thanks again

 

No way in hell I would run a 5 inch block in the rear.

 

I wheeled quite a bit with a 4” block If you’re gonna stay on the road then it’s fine. You might top out the shocks if you wheel and flex hard.

 

Why not run a 5” block? (I’m new to this stuff)

Also, I’m getting the 6-7” coilovers from my dad and his tundra has 5” block in the back and his truck was perfectly leveled. I don’t like rake at all so I was trying to mimic the same thing.