\6 knocking

I have spoke of my 64 dart with the slant six on here before. I replaced the origional with another \6. Three days after installing it the motor started knocking. We pulled the motor and found that a rod bearing was bad and checked the rest which were all good. We re installed the motor fired it up and the knock is still there. A lot of the old guys from our club havent been able to figure this out and neither can I . One other thing it started doing is the lifters are ticking which tells me lack of oil it smokes while running. Not sure if anyone could point me in a direction. I have also posted in another section on here on how to swap from a \6 to a 318.