Bro, I believe some later model of LandCruiser 70 series had 4 wheel discs but agree that these may be difficult to find. You should ask your local kabaria to source these for you instead of going on a wild diff-hunt to Peshawar, which rarely works unless you know the right people there. But bear in mind that even 2 wheel discs would work decently well, its just that 4 wheels would be ideal given the kinda power your engine will hopefully give you.
On LSDs, I wouldn't really bother too much to be honest as things should work pretty well without them. On diff-locks you can get these later, though it might cost you more, but honestly as long as you don't plan to do some really hardcore offroading, you will never really need these with the set-up you are going for.
i have tried almost every kabaria in faisalabad. Faisalabad is a market for either commercial vehicles or cars. cant really find any land cruiser parts here. and the kabarias keep asking me to give them a make and model. like "92 prado" or "police wali jeepain" so i dont no how to explain to them wut i want since i myself dont no the model
I would recommend that you should make a trip to Rawalpindi and visit the Jeep market at Citi Sadar Road. As far as FJ40s and older TLCs are concerned, firstly you can readily get everything from original engines down to dash board fittings. Secondly, you have access to experienced mechanics some of whom are true 40 series specialists deserving accreditation by the Japanese Emperor himself.