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i wouldnt use a fuse. if you run the wire right you shouldnt need one. but if you want one i would be a circuit breaker. plus its going to hve to be around 200 amps. your starting system can pull like 150 to over 200 amps.
200 from a car stereostore. you want a fuse next to the battery before the wires go under the carpet in case you get a short. this will prevent your carpet from catchin fire. BAD IF YOU ARE DRIVING WHEN IT HAPPENS CUS BY THE TIME YOU NOTICE, YOU ARE SERIOUSLY ON FIRE!