If you go full RUF with a 2" BL, 33's and 9/34 swampers will clear the firewall. The inner guard will need to be heavily hammered/removed around the headlight bucket.
Clearance at the rear won't really be a problem - some light hammering of the guard lip should do.
Here's a photo from about 1965 of Greg's old cappuccino engined junk.
Full RUF, small bumstop spacing on the front ( <1" from memory) Stock bumpstop configuration on the front, only moved forward for the RUF.
100mm shackles, 3 leaf OME packs, RS9010 front shocks on custom mounts, 2" BL.
The springs ran pretty flat at ride height. The RUF was at widetrack spring spacing.
No firewall mods at all. I think the seams were folded flat. That was it.
Rear guards were uncut. No bumpstop spacing on the rear.
Initially this car ran a drover front clip with the inner guards totally removed. After this clip was massacred, a sierra front clip went on with the inners just cut away around the back of the headlight. It was fine.
Steve.