[geofd]

Can not answer the question out be face off between the dissy and non dizzzy car.
In my experience the key issue with a dizzy is the pre-set advance curve, with electronics you can adjust the advance in a non linear way ( Actualy can retard it as it goes through the rev range if you want), with a dizzy the advance curve is fairly linear as it is governed by the advance weights (And vacuum advance). Of course you can mess around with the weights but in my experience this is vey hit and miss, or very time consuming to get right.
But how much impat this adjustability makes to the nord engine I cant say, in theory it should help to ensure optimum abvance in the complete rev range, so i exptec with good tunning it should make a noticeable diffeence in at least some areas during acceleration etc .