New and need help!!!!!

Bought a 73' dodge dart sport with a 318. Everything seems to be in good shape but being a…*gasp* import guy at one time this is all so new and,foreign,(heh) to me. I have been looking for suspension upgrades and such but outside of hotchkis i am unsure where to look. Any information on where to obtain parts (any parts,not only suspension) would be greatly appreciated. Looking forward to this new life.