What angles for engine/tranny and rear end for street/strip?
 

I'm newb in suspension questions, and after reading numerous threads it's still not clear to me.
What angles should I aim for when setting engine/transmission and rear end? Now while I'm building tranny crossmember I can alter these, but what should I go for? On one hand, you need 2* down for rear end pinion, on the other you need about 3* down for engine/tranny, that makes their relative angle 5* while angle must be 0 for u-joints to work properly.
Please explain what angles do I need?

Anyone?