My 292 is running a stock 1957 ball bearing style distributor with a Pertronix Unit.  I have the vacuum advance disconnected and the total timing set at 36 degrees. My engine idles and runs great.  I wish to bring my distributor advance all in by 3,000 RPM.  I do not have access to a distributor machine.  Back in the day we swapped springs around to "curve" the distributor.   Can I make this happen with just a timing light?