Looking for a daily, questions?

[Kidd-7]

I'm normally in the 67-72 area, but i'm looking for a daily in the next year or so. I have some questions?
When did extended cabs start being made?
Ideally I want a 4X4 350 manual tranny
How difficult is it to convert to 4X4 or the manual tranny?
When was fuel injection introduced?
What are some common issues to look for?
Lastly, price? Good shape, good running, minimal rust. Will be willing to do some work if the price is right.
Any other input or suggestions are appreciated, Thanks.