That is one expensive piece, but I may need one too!All you need is the solenoid for your carb application.
If you have a Holley, a unit of a Holley equipped vehicle like a Ford truck would be the part your looking for.
Wire the solenoid into your a/c clutch power.
Holley solenoid 46-74
Holley 20-9 http://classicstore.summitracing.co...filter=1&part=HLY-20-9&N=700+115&autoview=sku
or Holley 20-47
I priced them also.The ones from Holley and Edelbrock will cost about $100.00 I went to Ebay and found an aftermarket Solenoid for $16.00 including shipping.I will just have make my own bracket.That is one expensive piece, but I may need one too!