The only problem that I know of is they are notorious for breaking driveline parts that aren't up to the task! Any BB MoPar is as reliable as rocks and fire. There are no inherent problems with them. All of the "cool" hot rod stuff that the aftermarket has come up with for Chevy's like shaft rockers and "Air Gap" intake manifolds, BB MoPars have had from the fac-tree since the introduction of the 361 about 40 some years ago. You cannot go wrong with this engine!
Just a testimony to the reliability of this engine, My old Drag car ('74 Plymouth Duster) had a mild 440, 9:1 pistons, stock rod's/steel crank, 906 heads w/big valves and a MP .590" lift cam. It ran 10.70's all day, and had 11 seasons on it when I bought the car. I put three more seasons on it and sold it to a guy with a '64 Sport Fury when I ended my racing career (mariage). He still runs that motor, untouched to the tune of 11.20's through exhaust. Notorious for problems...indeed.
1983 CJ-7 Laredo, 1991 Cherokee Ltd.