Secretly: i occasionally yearn for mine... of course only because I'm not at the time driving it and wishing for better driveability or gearing.
You could easily enough to get past the e-brake issue (or alternatively, axle issue) PJ mentioned... There are circular pinion flanges available for ~$30 that you could use to mate the '60 shaft to the '40 axle.
You'd hafta modify the '60 shafts anyway to get the lengths right, so you could also just have them match the original '40 pinion flange pattern (either way you end up w/ a non-stock driveshaft, but this way you have a stock diff/pinion).
Other than that it's not so hard, to my understanding. I put a '78 2f in my '70 (both were FJ40's tho, and i was getting d-shafts done anyway due to SOA).
We could start a list of things you'd hafta think of: anyone, please chime in. Off the top of my head...
- throttle linkage/cable matching
- tranny tunnel mods
- fuel return line (1970 didn't have)
- wiring/control (depending on how de-smogged you'll run)
- (possibly necessary?) custom rear xmember for support of longer tranny
- driveshafts (as mentioned)
I like the 3otT except when I have to go faster than 45 mph. I plan on selling my twincharged Mini Cooper S and sinking at least some of the cash into the Cruiser with the goal being a light to medium capability off road vehicle that I could drive to, say, Harrisburg or Rausch Creek if I wanted to. That's why I'm tossing around this idea.