They all looked like that back then. The common denominator was ROOM TO WORK!!John that bears a strong resemblance to the engine bay and front end of my '72 El Camino SS.
Years ago I knew a guy with a truck that would run fine sitting still. But drive it and it would skip like crazy. He worked on it for weeks and eventually came up with a plan. He put a one of his friends or kids into the engine compartment with the hood off and took it down the street at night. The kid found the problem. Motor mount was worn enough that when the engine would torque to one side it was shorting out some wire. Problem solved.