Headlights and Front turn signals not working

Folks,
Problem solved!! (THX to 67dart273) Yes indeed, it appears that 1974 had a single common ground wire for the front grill lights. I found a stray black wire with a stripped bare end protruding from the wiring bundle where it passed out of the front of the engine compete near the horn. It must have been originally pinched under one of the radiator bolts (or something else up front) that was removed or disturbed during the engine work. Made up a lug end for it and grounded it to the bolt that secures the horn mount. We have lights again!
THX