I'm picking up the 14FF from a 1984 C20 pickup saturday that a guy is parting out. What else would be useful? I'm starting at $150 for the axle: 4.10 complete. What length rear springs would it have? I may try to pick up the wheels/tires too. I have a 91 V1500 sub, by the way. It had a 400, but that's already sole. Thanks CK5 bretheren.