The KE10 is an orphan in terms of parts being interchangable.
There are basic brake upgrades found in the Knowledge Base/FAQ link at the top of the page.
In terms of front struts, if you look at the base of the strut you'll notice it is a 3 bolt arrangement, nearly all later model cars have a 2 bolt setup.
Therefore straight swaps is not possible.
Swapping out the steering arms wont help much unless you like massive negative camber.
Swapping the lower control arm wont help either as this is a wishbone setup.
Therefore as mentioned, you may want to start from scratch for the front end.
As for the diff, again you'll find some info in the Knowldge Base/FAQ link.
No such 'locker diff' or LSD is known to exist for the standard KE10 diff, an upgrade would be advisable if looking to run a V6.
Some research will reveal suitable diffs, most of which will require shortening mods.
I tend to find this link very helpful.