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My 67 has a larger cam that was in the car when I purchased it last year, I have the problems you are speaking of regarding pinging that can't be removed with timing. When I'm in a parking lot at low speed the power brakes feel manual although they are 4 wheel disc.
I am considering changing the brake booster from ported to manifold vacuum to see if that will correct the braking problems and maybe install thicker head gaskets to lower the compression and hopefully correct the pinging.
I'm not sure which cam is in my car but it sounds good while driving through car shows.
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