I did the conversion, rather simple but not a "bolt on".
I used a Holley electric choke http://www.summitracing.com/parts/HLY-45-258/
Outside diameter of the Holley part must be turned down to fit the 4100, I believe about .060"
The "tang" that goes inside the bi-metal coil must be shortened somewhat, the Holley part is not as deep as the Autolite.
I simply made a 1/4" tubing bypass so clean air would be drawn through the choke coil.
Works great! My Stealth intake had no provisions for the heat coil (460) and I blocked the crossover heat.