carbon

Just got H.O. 5.0 from the junkyard. Swapping the efi for my carb setup. When I pulled the stock intake off I noticed some carbon buildup, it looked like charcoal bricks stuck the the interior walls? Was wondering what this is? And what's the best way to clean it out? Also. What's the best way...

Just bought an '86 Bronco II 2.9, automatic. It starts but runs really weak. Lots of leakage at valve covers and the one spark plug I pulled was jet black with powdery carbon deposits. There does not appear to be any evidence of water in the oil, but it is over the fill line and smells like...