is there a way to put super stock leaf springs in 74 road runner?

yep just as any other car, f bodies etc, just use the front mount off older b body , some of those had the rubber isolators , get rid of those to use standard leaf spring mounts , good to go

you need the 2" longer rear leaf spring brackets as the super stock springs are a 20inch front segment and your springs are 22" - I've seen them sell them at jims auto parts and firm feel inc...