All I know about dizzy and spark plugs is don't heat shrink the cable to the spark plugs and to the dizzy cap.
screw in the spark plugs and then spray copious amounts of cleaning fluid into it. wipe off them silicon seal the dizzy cap on.
Then get a mate to turn it over whilst leaning over the dizzy cap
result BOOM, POP, ARRRGGGHHHH
followed by three mate, one a responsible first aider, falling over and slowly dying from laughing