There were 2 different factory radiators commonly used in these Mustangs. One was smaller, top / bottom tank design used on early 4 cylinder cars, usually mounted using a sheet metal extension to get the radiator closer to the engine. The second was a 2 core cross flow design. The cross flow design will work on a mild 302 if it is in decent shape. Don’t even try the smaller it isn’t big enough. For any type of high performance application get a new 3-core copper or aluminum radiator. Also always run a thermostat - engines will have dramatically less wear and perform better at the correct operating temperature.
drrrrr errrrrrrrr a 4 cylinder wouldnt need as much cooling as a 8 cylinder, but a 8 cylinder would need alot more, so the point is, no it wont, usually a radiator for a 8 cylinder car is much bigger than a 4 cylinder radiator.