Kit's a kit. You can get an inexpensive one. All it is is gaskets, clips, check ball, float valve and hopefully accelerator pump. No reason to pay 2 or 3 times as much for one with a marine tag on it.
I bought a kit on ebay and ended up with 11 months of trouble as the incorrect brass float was supplied. Call cliff ruggles and get one of his rebuild kits, well worth sixty bucks