This all boils down to what you intend to do with the car. If you're going to drive it on the street most of the time, and occasionally take it to the track, then a triangulated 3 or 4 bar suspension with urethane bushings like techinspector1 said. If you are leaning towards the 4 link, you'll have to eliminate the leaf springs, and install coil over shocks. By using a ladder bar type suspension, you can retain the leaf springs, but will it will give you a stiffer ride. I'm not saying Streets was wrong, as both types of suspensions can be used in either application, it's just that one is more adjustable than the other. A 4 link can be made to run very easily on the street, as well as the ladder bar type. I have a 4 link on my 60, but the car is only used only the track. Attend some cruise nights in your area and check out what people with your type of car are running for suspension, and talk to them. Then go to the drag strip and do the same thing. That is the only way you will be able to make a decision without getting hundreds of different opinions from internet boards.