I bought my '72 SS as a numbers matching car several year ago. Shortly after I found the carb was a '78, but it ran great, so I left it alone. Since then I've looked for an original 7042202 and finally just found one. I haven't rebuilt it yet, but I noticed the "72 Q-Jet has an idle speed solenoid with a male electric plug-in. The '78 doesn't. I don't see a wire to connect the '72 Q-Jet and I'm asking if I can run without the ISS. I don't have A/C, only drive on nice summer days and I've seen '72 cars without them at car shows, but never thought to ask. At first glance, it seems unnecessary, plus it looks better without it hanging out there. Thanks.