Rebuilt 340 knocking sound

Engine was cool, i just did one plug at a time, with all the other plugs in, cylinders dry. I still need to move it before I tear back down. It fires right up, just starts to knock. wish I could get the video on here for you guys. I bought from a member, was supposed to be ready to run just needed to be primed. I have been a member here for over 15 years, if anyone is interested send me your phone # I will text you the video