Tom---That sounds like a great plan. If it was me I would look for an 8" rearend out of a Mustang, Maverick, or Granada, (they are the right width), however the old Ford should work alright if you are going with a V6 powerplant. If you are planning to go with the split front wishbones and a 4" droppped axle, be aware that you could get into trouble with the steering tie rod or drag link running smack into the split wishbone from the side. That is why many guys go to hairpin style wishbones---that way the tie-rod and/or drag link can run thru the center of the hairpin.