bigger radiator

I have a '94 YJ with a 4 banger. It started running hot with me the other day sitting in traffic. The outside temp. was around 80. It was full of coolant so that wasn't the problem. I have noticed there were some corrosion build up inside. I know it can be cleaned out but I would like to install a bigger radiator. I have plans in the future to put in a v8. Is there any other radiator out there that can be put in from any other vehicles or do I have to spend the big bucks for an aluminum 3 core?
 
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