It's a 302 by the way. You may see excessive fuel pressure, or pressure quickly dropping after the engines shut off.
First would be the regulator (sometimes you'll see fuel when you remove the vac hose).
Second would be injectors failing to seat closed.
There used to be a great injector cleaned that was in an aerosol can. It screwed right onto the needle valve on the injector rail. I think NAPA carried it. You could always run a can of Seafoam in the gas. Or Lucas injector cleaner.