With a small block, and a TH350, glass hood, (the stock one weighs a ton) and Weld wheels, with the heater, and wipers removed, half tank of gas, and no spare, without driver, with frame connectors,...
Ok. Some of the early Chevies do not have a 12 volt source for the coil, in the cranking mode. You can run a wire from the selenoid, to the coil. If that does not help, then, you may have a ballast...
There are a lot of factors to consider. Model, condition, geographic location, ect. Use a search engine, and type in your specifications. See what you can find that compares, in your area. There are...