Power to Manual Brakes - D150

I used the normal 4 bolt to 2 bolt adapter from Mancini on my 1977 D100, when going from power to manual,same adapter as I used on both my A bodies. I used a 1.0625" and the pedal is really hard, with very little travel. Adjust bore size to suit your preference for pedal feel..I think power equipped vehicles had a different pushrod bolt location in relation to the pivot.