Carb heat shield . . . anyone try this?

My 69 Super Bee w/6pack had the exact same symptoms so bad that during the summer the former owner would change out the ballast resistor and it would work for a while. What he didn't realise was by the time he went and got the resistor everything had cooled down to where it would start right up.
When I bought the car and found over 1/2 doz "good" ballast resistors I thought Oh Chit what now??
Any way to make a long story short since I installed a MSD (multi strike ignition) ignition dist, box and coil. It always starts right up now.
Hope this helps.
Good luck