I don't think the LS1 even has those parts that broke?, assuming we are talking about a roller VT 5litre here. Camtech are a good company as are Wade both will be able to sort you out with a good small cam. You can fix the smaller base circle on the cam with either pushrods or shims. But a new cam shouldn't be anymore expensive and saves you the trouble. Johnson lifters are supposed to be the best you can get but I'm not sure they are made anymore or not made in the states like they used to be. Holden probably would have used them OEM in the motors in the first place