I'll throw in my two cents about the body lift since I just finished installing the ORD 1" pucks and poly body mounts myself.
First thing I'd mention that I don't ever see anybody else saying is the job to
remove the mounts themselves is not going to be fun. Unless you're smart enough to go under your truck and get lucky enough to have penetrating lube hit the captured nuts / bolts just right, the captured nuts will break loose in their stupid mounts and just spin away. (There are holes in the cab that seem to give you access to the nuts but not easy to hit with the lube).
Granted the instructions warn about this, but on my rig there was no cure for the rust and junk that had stuck the bolts after nearly 30 years. I had to actually cut the cab floor open on those back two and then weld the nuts so they'd stop spinning..
Again, I'm sure that your experience just as others might vary but my rig came from down south and was never even driven in the salt, etc..
I like the suggestions some have made about the 1" body lift plus some zero rates, (ez-inch, whatever..).
Another idea is a shackle flip out back & it will get you 4" without much effort at all. But then you'd have to find some way to get the front brought up there too. Maybe some longer shackles and zero rates?? That would leave you with a nice stance too, and correct the tendency for the front to look higher than the back if your truck is evenly lifted. But then you'd still have those nasty old body mounts if you decided to just lift purely suspension.
Like others have said, those mounts are often beyond shot needing replacement badly. The bolts in the front on mine had rusted in half!
Here's a few photos of what you might expect to find..
This last one shows half the mount, and then the 1" puck sitting on top. the mount simply drops into the hole seen above in the frame and then clamps with a huge washer and another bushing not pictured here from underneath.
Good luck with your plans!