74 power wagon dream truck...

For a 33" tire I'd use no more than 4" lift. You could likely get away with a 3" body lift alone. On the truck I am rebuilding with my son I chose to omit the body lift I used to have on it and stick with the 4" lift springs. I never liked the body lift. It bolts on with real long bolts through spacers. May not be the best in a roll over.
I will be using 35x12.5-17 tires. I have used 35s with this suspension set up before.
From what I have learned about all this over the years, if you definitely want a body lift, do about a 2" spring lift and a 2" body lift. Otherwise do a 4" spring lift and you will fit the 33s no problem!
For the back on the truck I am currently doing, I did a rear shackle flip and some 1/2 ton stock springs. This should bring me to about 4" lift in the rear. I won't be hauling much with this deal so the shackle flip is good for me. Since you will be hauling, I don't think the shackle flip would be the thing for you. If you can find matching rear lift springs then that's good, luckily you can adjust your rear height between spring height and block height. Just my opinion but I'd never go more than stock block height or stack blocks. Seems like bad JUJUto me!
Cley