Classic/Antique Car Repair: weak spark, plug wires, mallory

Question
73 vette   454   electronic  dist    seems to have weak spark   more noticable  when  hot  i did  buy and install  a new coi  m s   but just looks  weak  any ideas   thanks   dond blaster but the spark still seems a little  weak  may jump 1/2 inch or  so  

Answer
hi;
    is the car running bad , if there is a spark that is only a 1/2 inch, i think it should be more than that but if it has a big loud snap to it thats ok.you can take off one of the plug wires and put it on a old plug that is being  held with a insolated tool or glove and ground the plug to the motor and see what type of a spark it is giving to the plug if it is a nice bright one with a snap to it thats good...but if not its time to look into a nice mallory set up or some h.d. dist..
good luck
roger