Oil Pump shaft broke

My car hasn't been cranked up in about 3 months so I decided to go crank it up & get to operating temp. Cranked the car up to let it warm up & noticed no oil pressure.
After testing sending unit, pulled distributor & pump shaft & found the tip broke off. Glad I wasn't driving it when this happened! I'm running a Melling M72HV pump. My oil pump shaft is stock. I've built a 340 before in the 80's with the same pump & stock gear & I ran the car hard & never had a problem. I'm taking the oil pan off & removing the oil pump & checking it out.Do you guys think I should just replace the pump & be on the safe side or is it just to much pressure on a stock pump shaft using a high volume pump.I'm ordering a new Mopar performance oil pump shaft & bigger pickup tube since I'll already have the oil pan off.I plan on taking one rod cap off & checking to make sure it didn't run dry. Thoughts?