Before you mess with curve...make some degree marks and TDC mark on pulley and find out what it is doing!! You want to see how much advance is happening when, and see that it comes in fast and ends not much beyond 2,000 RPM.
You can CRUDELY ascertain existing total by putting on rotor, marking where it points on the aluminum rim, then twisting it hard in direction of advance and marking again. Measure with a protractor and DOUBLE those degrees.
Next, to get good TDC on an assembled engine, closer to perfection than the stock '49 bump:
Start HERE:
http://www.jalopyjournal.com/?p=10940
There's a bit more discussion in comments link, but this method allows using simple drawing tools and cardboard after you find TDC and mark off degrees for your rngines timing range.
NOW...with pulley degreed, your engine is your distributor machine. Check initial timing using your marks and a timing light, then slowly rev up engine while someone watches a tachometer and note how much centrifugal advance at what RPM. THEN we can know whether your Mallory needs to visit the re-education camp!