IF you happen to come across a performance distributor for a Lima block, M block, or Cleveland and you are needing one for a 351 W, all that is needed is to contact the manufacturer of the distributor and order a 351 cam gear for that distributor. They are all the same except for the gear. That works the other way around as well. Sorry but the small block distributor has a smaller shaft and drives a smaller oil pump shaft so it wont work in the other engines.