MSD distributor 408 stroker

So here is the picture of the difference in the shaft length of the two distributors. So I’m kind of stuck in betwixt and between the engine builder has not gotten back to me after two voicemails today. I’m wondering if he used a different Oil pump shaft length? What is the OEM length of the shaft? I can pull it out and check it this weekend. Apparently this was a budget build -the original distributor is nothing special kind of a knock off piece of ****. Any ideas on something I could have done at a machine shop?