I think that the Dodge trucks have a shorter front end than the Chevy or Ford of the same era. My 84 Chevy had a whole lot of room underhood.
I've had 3 of these trucks....A 74 Camper 9000, a 75 Power Wagon and a 78 Trail Duster. The last 2 were factory 440 trucks. The 74 was a 360 truck. I built a 440 for it and had it complete when I swapped it in. I needed to change the valve cover gaskets one time and was PISSED when I could not get the left one off. I used STUDS when I built the engine in an attempt to avoid leaks.