Frame off start and questions

[mcm1209]

Been lurking for a while and I'm finally starting my build. Picking up a stock short bed frame this weekend. Ill do all the frame work then send to PC.

I know I want to go with air bags. I already ordered Wilwood drop spindles and researching control arms. I see there are "1' forward" arms. I have tried looking for pics of what this "fixes" but haven't really found anything describing it.
Thinking I'm going with Switch Suspension upper and lower arms.

https://switchsuspension.com/chevrol...-control-arms/

Thanks