It should be either under the hood in the engine compartment or in your owners manual.
2 carpros.com/car
chilton manual
more horsepower on the magnum
It's in your owners manual.
There is no such engine as a 350 magnum
You need a gunsmith.
Do you just meed the friction ring diagram? Use the link below. Be sure to follow the Magnum diagram. The online manual can be found using the the other link below.
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You don't, It is self tightening. If the belt is loose one or two things is wrong. Either the belt is worn out and has stretched beyond what the tensioner can adjust for, or the tensioner is defective or both.
Matt Eastman's book has a pretty good schematic.
Mopar Magnum 318 CID