I know I have an electric fuel pump my uncle installed, did that replace the mechanical fuel pump it had? The electric pump is mounted on the left fender wall
The mechanical fuel pump is on the drivers side front of the engine just bellow the distributor. If they completely replaced it, they would have to have a 'cap' bolted in its place to keep from loosing all your oil. Here is some photos to help...
This is a after market mechanical pump (I think it's a carter proformance unit).
This is a newer stock looking one, It'll have a hard factory bent aluminum flare fuel line up In front of the engine and across the top of the intake into the carb.... That section is where everyone is talking about vapor lock happening due to the heat transfer of the engine. It does happen but rare and would have to be a hot day in traffic to do it 'usually'. Split a 1/2 inch rubber hose and clamp or zip tie around it to help 'insulate' it.
A good electric pump should push through a mechanical pump ( I had both on my desert race rig and it would do it) unless its 'sun dried' shut from sitting in the Arizona heat. I would go through the fuel system completely first before going extreme with new aftermarket systems.
If the rig sat in the AZ heat without running for a while, then the carb has crud and dried fuel varnish in the bowel and needle ports. A quick carb job will fix that, a carb rebuild gasket kit isn't much cost and you can 'bench clean' it yourself with a couple cans of carb cleaner.