Chainsaw Repair

I ran into a situation that I still have not figured out. I was rebuilding a 372 and all was going well, until the pressure/vac test. I had a leak on the clutch side. Had replaced the bearings, case gasket and clutch side o-ring and both seals. Leak was so bad saw would not hold any pressure at all.  Needless to say I immediately suspected the clutch side seal and that was the leak. Pulled it and installed a new one, saw still leaked. Could not tell if the leak was coming from between the crankshaft and the seal or between the seal and the case. But that ran me out of seals. Even replaced the o-ring.