ignition timing question 1972 400

Ive been tuning my motor up, this is a stock 400 with a 270 duration Rv cam, 625 Carter carb headers, the distributor is an original electronic type. The first thing I checked was the rpm for all in timing, it wasn't all in untill over 4k. I took it apart and removed the heavy spring, its now all in at about 2k and seems to be much more responsive. I didn't change the mechanical limit/slots. I have it timed at 16 degrees initial, all in at 2k is right at 40 degrees. I havent driven it yet but it seems to run and Rev good. The trans is a 727 with a factory high stall, 3.91 rear gear. Is the timing do-able set like this?