Thank you!! Yes I will hang it level, just wondering if it will look ok with the chains not being equal length because of the sloped ceiling or if I need to stick with a chandelier that has one wire.

I think it will look fine with chains of different length. The focus is the chandelier, not the chains. I'd go with it!

No, we were advised against it and found another crystal

I'm an electrician. There's no natural looking way to get the precise adjustment you need with chains. You might get lucky & have the required length land on an even link, but probably not.