1968 Plymouth Valiant First Gen HEMI

abdywgn said

is this the brackets used for an A-body power brake booster? A friend did that on his 66 A-body and had issues that I believe he decided was related to the pedal ratio.

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that could be when removing those brackets. i went to manual brakes on my 68 valiant, the pedal ratio was the same on servo and non servo so i hoped it's be ok. no..... the pedal was very hard with less travel and no feel...... or power. the pedal would need drilling closer to the pivot where the clevis connects.
going from manual (direct on the bulkhead) to the servo type brackets will if my assumption is correct improve the brakes at the expense of a slightly 'longer' pedal travel.
neil.