Engine wants to die at stop lights

I thought dimming lights on these older cars was "normal" when the engine idles too low, as in when it wants to die out?

I have a big cam in my 318 and when she idles in drive the lights do dim....no problem once I get off of idle.

It is normal if you still have the stock electronics. There are several upgrades you can do to prevent that, though. But from his description, I think you nailed it as being a normal thing.