Top 5 A-body mods...

No doubt about it, D.I.N. compatible rallye dash is number 1.
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2. Rear lighting. A high mount brake lamp and added bulb sockets in the rear lamp fixtures.
3. Power steering and smaller steering wheel.
4. Modified the OEM automatic floor shifter ( no pic handy ).
5. Electrical upgrades, ignition, headlights, etc...
So creature comforts is my priority, followed by safety.