Use or don't use vacuum advance on distributor???????????????????

Right now I am using a stock mopar electronic vacuum advance distributor with MSD 6AL box and MSD blaster 2 coil. I am considering going to the MSD pro billit with no vacuum advance. Now comes the question. Is it better to use a vacuum advance distributor on a street car with a mild performance setup or no vacuum advance? I know with the stock distributor I can set total timing at 34* at 3500 and rev the motor on up and it will keep advancing to the 50* or so. I am assuming that the MSD pro billit with no vacuum advance would lock in at 34* total and stay there. Is this correct?