I love the 64, Good luck with your build.
I went a little heavy handed with my build, still running stock brakes and my last trip down hill was 8000 foot elevation change in about an hour and half. Didn't have any problems. I did change master cylinder but that was mostly for clearance of clutch master install.
My old power assist steering was antiquated so I installed power box up front, this requires moving cross member.
I was able to fit 33" on 15 x 10 but my fenders are cut.
I used yj (I think) rear springs up front with longer relocated shackles, and rear shackles flipped with 2.5"
Blocks in the back and longer shocks and brake lines all around. I really really enjoy this setup, fairly inexpensive and simple with great ride quality.
Hope your turns out nicer than mine.
https://www.fsjnetwork.com/forum/downlo ... hp?id=7629
The springs I used up front are
rubicon express 1430 49786
I believe it's a 2.5" lift spring for yj rear.