Been discussed her already.
If you want to do a rat rod, proper way is to split the stock Ford wishbone and attach it to the frame rails, weld a plate out front of the frame with a couple of gussets and bolt on the axle. Suspension will bind a little but not intolerable and authentic. If you want better action, go with 4-bar links but that ain't rat! See photos in car mags or shoot some at a rod runs for the details.