I have a 1981 Z28 with a 350 V8. I would like to replace the radiator but there are 3 different radiators for this year and engine size. How do I measure the radiator to make sure I order the correct replacement?
Also - the car runs really hot. Any suggestions on a thermostat replacement?

 

Welcome to the site. This area isn't the place to get answers. This is where you introduce yourself and your car.
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I'm guessing that the difference in choices is probably the core thickness. The thicker the core, the higher the cooling capacity. Choose what fits your needs. A 180° thermostat is probably suitable for your application.