FMJ spindles > POLL

Bearhawke said

For the record: IF we're going to squabble over non factory mods on an A body; then it should be 'illegal' to install a 1967 up dual chamber drum brake master cylinder onto a 1966 down model with the same size drums...........

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Factory-engineered part and application, not a problem. (In fact, wasn't a 1967 A-body a carryover year aside from that?)

Another modification could be 3 point seatbelts since the B pillars on 1973 down post cars may not be strong enough to support them in a severe crash.

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A-bodies came with 3-point belts (as did other cars back to at least 1971)--and bad installation endangers only the car's occupants, unlike suspension or brakes.