Based on the look of your motor I would probably get some cheater valve covers in the original style and use the built in wire looms which attach directly to the valve cover.
Originally there was a bracket that mounted to the intake for the carb return spring as seen below by the orange triangular shaped piece with a hole in the middle
Today you can find quite a few variations with the return spring built in. My favorite and the one I use on my motor is the Holley bracket (summit & jegs make their own which are less expensive).
