4 links like horsepower. A 9.90 car (low 1.40 60s or so) will need to get the gear retios right to make it work. A 2.45 727 should be fine. I like 4 links. It allows you to do so much more than a ladder bar. But I don't think a ladder bar would be a handicap in your situation. The closer you get to the 8s, the more a 4 link makes sense. Spend the money on a good, pro level ladder bar system and some good coil-over shocks, support the back of the car correctly and you should be fine.