Whats everone working on?

Just got it back with the new Auburn diff and a set of 355,s. Next I need to pull the plugs and have a look see, I'm hearing a popping sound at the tail pipe,drivers side, when at an idle, not sure what that is. Also need to fix valve cover leaks at the rear on both sides,its spewing enough to make smoke when I shut down, can't seem to get those buggers to seal, they are the aluminum mopar covers, any suggestions? :roll: