A couple questions. I am doing a 29 Model A sedan. I am building my own frame from 2x3x3/16" tubing. Doing air bags in all four corners. Rear seems easy, doing a triangulated 4-bar. My question wanders around the front end. Those that have built them. What caster angle do y'all set yours? Is some built into the axle? It's a new axle from SAE-Speed out of California. I ordered some split wishy's from Speedway with a heim joint at the rear. I know the SBC has been played out, but that's what I have. If I can find a Chevy straight six, that's what I would like to have eventually. I have an empty block and trans for mock up, but I need to know if I need to incorporate some caster in there, and how that plays with air springs. Thanks in advance!