'67 Dart - No stop lights, turn signals on but don't flash
1157 is longer rate life for one of the filaments but pulls more current. You can use them but it slightly changes the flash rate and slightly increases the load on the system. 1034 and 1034A are the correct bulbs if you can find them.
I would check the dome light and hazzard operations first.
Then check the fuse if those are not working.
Then check all 6 bulbs for hazzard and turn operation again.
The turn signal indicators in the instrument panel are a part of the load. Its possible if those are out they will not flash.\
edit. Brake lights: Check Bulbs, then switch that touches brake pedal.
Flashers units. On a LHD car
Flasher for Hazzard 4 ways on left side of steering column bracket.
Flasher for Turn signals with its wiring on bench.
Another view of bracket location for the turn flasher. RHD is in the same location.