Solid Roller lifters

Hey bomber I guess my question is kinda the same. I have an 89 La hydraulic roller and I got a new billet roller cam and I was looking at that brass bushing today wondering if the stock pump drive shaft is sufficient? I've got a few bucks in this and don't want to loose it. The pump shaft looks like its a good one but looks don't mean chit. Thanks for the info and I'm sorry if its redundant.