1970 Chevelle Big Wheel question

[71chevellels1]

Wheel gurus chime in. 1970 chevelle stock frame and tubs. 9" moser rearend shortened 1 3/4 PER side. I know I will have to roll the inner fender lip but if I was going to run a custom billet rim what offset do I want so I can run a 315?



The wheel I want I can get it in a 20x10 or a 20x10.5.



Thanks for your help!

[71chevellels1]

Ok what about a 305?? 20x10 with a 305 on a rearend that's been shortened 1 3/4 per side?? What offset do I need?