DKY4A Distributor swop?

[John Gould]

Hi, my DJ4A distributor has seen much better days and I have an ex Triumph TR2, DKY4A distributor (non vacuum advance) in excellent order, measuring them up it looks as if all I have to do is change the key on the base of the DKY to the gear from the DJ4A - looks simple enough. Not bothered about originality as it's a special (with a Ruby engine) but I do wonder if perhaps the timing advance would be too great.  
Anyone already done this? Also any more thoughts you might have would be welcome.
Thanks, John.