I use the diff for the rear of course, But where is it safe for the car to be jacked up on the front that dosnt result in twisted metal, Clearly a large base on the jack would help but i dont have the luxury at the moment. Any suggestions?
Use the engine cross member
Front Rad support or K-Frame…
I have been using the front rad support all winter and its strating to bend 
but if you put some wood there you will be good to go.
engine crossmember, auto>manual and 2 clutches later and no ill effects
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If your car is low and you can’t get a jack under the front then:
http://240sx.cubicdesign.com/article3.php -
Once a little up in the front, put a jack under the engine cross member
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???
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Profit