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I am not real familiar with the EFI 302's with their computer system, oxygen sensors and EGR valves. If you are conveting that EFI engine to a carbureted version here is some reading. http://www.fast351.com/tech/fitocarb.htm
If you use a mechanical fuel pump (and thats my advice), you need to mount an excentric wheel on the end of the camshaft to operate the pump. Any 289cid excentric wheel is a direct fit, but you need a longer stud going through the excentric wheel to prevent it from rotating.