Updates.
I bought 2 sets of shafts. 1 set from mancini racing, their own hard chrome shafts. I run the engine for 5minutes and checked the shafts. Already worn out, i could clearly see that the shafts cannot take the load.
Now i have had 10runs with my new harland sharp shafts and they look like brand new. Very expensive but very good stuff.
Well, this is drag racing engine with needle bearings so i believe that the mancini shafts will survive in normal engine.