Magnum oil pump

I tried replacing the oil pump with a new one .melling #m-72 . When installed the oil pan would not sit flush and kinda hits the oil pick up tube . It’s on at the tightest and sitting leveled. When the original pump is on it sits flush . I cross referenced the Oil pump (M-72) and it pretty much is the same oil pump for small blocks . Anyone else have issues when replacing the oil pump? I suspect the original pump is still good still have yet to open it up and check tolerances. I had a new oil pump laying around from a previous build that didn’t workout just hate to have a fresh part just laying on the shelf. Any feedback / suggestions/experiences are appreciated thanks in advance.
Are you using the the same pick up tube with the two different pumps? Are you sure you don’t have an M-72HV version pump?

I hope they didn’t change these, or outsource them. Post a picture of the pump showing the part number.

One last thought; where did you buy the pump? Wondering if it’s an eBay or Amazon counterfeit. Summit and other big box stores should have real ones from Melling.