I put my 5.0 and 4 speed in for less money than a 318 swap minus a transmission. Haven't had any issues with the engine or drivetrain since. Unlike the slant 6 that needed attention almost every weekend. I'm getting great mileage and it's as reliable as can be. The only trouble I have comes from Mopar guys who just want to argue about it.
I have no problem with it (but then, you're not a complete dillhole about it like guys who want to put chevy motors in their mopars seem to be. Also, I have no problem with mustangs lol)