Installing a 2nd HDD to Dell Dimension 4300 - Jumpers?

Greetings all from Oregon, the shower me state.

My wife's Computer is a Dell Dimension 4300 system. The original primary drive is failing, so I purchased a WD3200AAJB 320GB drive to install as a new Master drive and make this failing drive the slave to move the programs and data before it utterly fails.

On my Inspiron 518 downtown I got away with using C/SEL when I added a 2nd drive and it took right off and has been stable for the last three years.

My Question: What are the correct settings for the Drives in a Dimension 4300? Can I get away with C/SEL or must I assign Master and Slave?

(Sounds kinda kinky)

Thanks and a lift of the lynch lid for your response.

Gus