this is hard to answer, it depends on how soon you want total timing. which depends rear end ratio, how much cam, headers or not (less exhaust gas in the fresh charge) the weight of the car, and on and on. What and why one combination of springs works for me and not for someone else, depends on too many things. Best thing to do is first as you mentioned make sure your vibration dampener is correct, you can sometimes use measurements based on the keyway. If thats right, with a timing light and a tach see what RPM the timing starts to move and what RPM it is at total. A good place to start is around 2500, the carb will be in the high circuit, and don't forget to do this with the vac.advance disconnected, and the port pluged. After that if it is too soon you need to start switching springs. Once you have a baseline test and tune night at you local track, if you want can help dial it in for whats best for you. Keep notes on what the timing is at diferent RPM and as you make changes you can track them.